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		<h1>​Hướng dẫn giải bài tập SGK Hoá học lớp 10 bài 25&#x3A; Flo - Brom - Iot</h1>
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			​Hướng dẫn giải bài tập SGK Hoá học lớp 10 bài 25: Flo - Brom - Iot
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			<h3 id="mcetoc_1c5i0dt360" style="margin: 0px; padding: 8px 0px; border: 0px; font-variant-numeric: inherit; font-weight: 700; font-stretch: inherit; font-size: 1.1em; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Giải bài 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,&nbsp; trang 113, 114 SGK Hóa 10:&nbsp;<strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Flo - Brom - Iot</strong></h3><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 1: Dung dịch axit nào sau đây không thể chứa trong bình thủy tinh:</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">A. HCl.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">B. H<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>SO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">4</sub>.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">C. HNO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">3</sub>.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">D. HF.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">D đúng.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 2: Đổ dung dịch chứa 1g HBr vào dung dịch chứa 1g NaOH. Nhúng giấy quỳ tím vào dung dịch thu được thì giấy quỳ tím chuyển sang nàu nào sau đây:</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">A. Màu đỏ.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">B. Màu xanh.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">C. Không đổi màu.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">D. Không xác được.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">B đúng.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 3: So sánh tính chất oxi hóa của các đơn chất F<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>,Cl<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>, Br<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>, I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;và tính khử của những hợp chất HF, HCl, HBr, HI. Dẫn ra những phương trình hóa học để minh họa.</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Tính oxi hóa giảm dần từ F<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;đến I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">- Flo là phi kim mạnh nhất, oxi hóa được tất cả các kim loại kể cả vàng và platin. Clo, Br và Iot tác dụng được với một số kim loại.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">- Phản ứng với hiđro.</p><h2 id="mcetoc_1c5hrh0on0" style="margin: 0px; padding: 16px 0px 8px; border: 0px; font-variant-numeric: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgb(0, 51, 153); text-align: justify;"><img alt="Flo - Brom - Iot" data-i="0" height="95" src="https://sachgiai.com/uploads/news/2018_03/giai-bai-tap-trang-113-114-sgk-hoa-hoc-lop-10-flo-brom-iot.jpg" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; height: auto; max-width: 100%;" width="194" /></h2><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 4: Phản ứng của các đơn chất halogen với nước xảy ra như thế nào? Viết phương trình phản ứng, nếu có?</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Khi tan trong nước, các halogen tác dụng với nước, flo phản ứng mãnh liệt với nước giải phóng oxi.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">2F<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;+ 2H<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>O → 4HF + O<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Với brom và clo thì phản ứng xảy ra theo hướng khác, brom tác dụng với nước chậm hơn.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Br<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;+ H<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>O ⇆ HBr + HBrO.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Cl<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;+ H<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>O ⇆ HCl + HClO</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Iot không phản ứng với nước</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 5: Muối NaCl có lẫn tạp chất là NaI.</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">a) Làm thế nào để chứng minh rằng trong muối NaCl nói trên có lẫn tạp chất NaI?.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">b) Làm thế nào để có NaCl tinh khiết.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">a) Để chứng minh rằng trong muối NaCl có lẫn tạp chất NaI, người ta sục khí clo vào dung dịch muối NaCl có lẫn tạp chất NaI, nếu có kết tủa màu đen tím tác dụng với hồ tinh bột tạo thành hợp chất màu xanh thì chứng tỏ trong muối NaCl có lẫn tạp chất NaI.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">b) Để thu được NaCl tinh khiết, người ta sục khí clo dư vào dung dịch NaCl có lẫn tạp chất NaI, lọc kết tủa (hoặc đun nonngs iot rắn biến thành hơi) được NaCl tinh khiết trong dung dịch nước lọc.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Cl<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;+ 2NaI → 2NaCl + I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;(màu đen tím).</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 6: Sẽ quan sát được hiện tượng gì khi ta thêm dần dần nước clo vào dung dịch kali iotua có chứa sẵn một ít hồ tinh bột? Dẫn ra phương trình phản ứng mà em biết.</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">- Khí Cl<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;oxi hóa KI thành I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>, Cl<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;và I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;tan trong nước, do đó xuất hiện dung dịch màu vàng nâu.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Cl<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;+ 2KI 2KCl + I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">- Sau đó dung dịch vàng nâu chuyển sang màu xanh do iot tác dụng với hồ tinh bột.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">- Do thêm dần dần nước clo, nên màu xanh của hồ tinh bột và iot cũng bị mất màu, do một phần khí Cl<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;tác dụng với nước tạo ra axit</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">HClO có tính oxi hóa mạnh, axit này làm mất màu xanh của tinh bột và iot.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Cl<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;+ H<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>O ⇆ HCl + HClO</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 7: Ở điều kiện tiêu chuẩn, 1 lít nước hòa tan 350 lít khí HBr. Tính nồng độ phần trăm của dung dịch axit bromhiđric thu được.</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">nHBr = 350 / 22,4 = 15,625 mol.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">mHBr = 15,625 x 81 = 1265,625g.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">C%HBr = 1265,625 x 100% / (1000 + 1265,625) ≈ 55,86%.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 8: Cho 1,03 gam muối natri halogenua (A) tác dụng với dung dịch AgNO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">3</sub>dư thì thu được một kết tủa, kết tủa này sau khi phân hủy hoàn toàn cho 1,08 gam bạc. Xác định tên muối A.</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">nAgX = nAg = 1,08 / 108 = 0,01 mol.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Phương trình hóa học của phản ứng:</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Đặt X là kí hiệu, nguyên tử khối của halogen.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">NaX + AgNO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">3</sub>&nbsp;→ AgX + NaNO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">3</sub>.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">2AgX → 2Ag + X2.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">nNaX = 0,01.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">MNaX = 1,03 / 0,01 = 103.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">X = 103 – 23 = 80 (Br).</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Muối A có công thức phân tử là NaBr.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 9: Tính khối lượng CaF<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;cần dùng để điều chế 2,5kg dung dịch axit flohidric nồng độ 40%. Biết hiệu suất phản ứng là 80 %.</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">mHF = 40 x 2,5 / 100 = 1kg.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Phương trình hóa học của phản ứng:</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">CaF<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;+ H<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>SO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">4</sub>&nbsp;→ CaSO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">4</sub>&nbsp;+ 2 HF</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">nHF = 1/20 mol.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">nCaF<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;= 1/40 mol.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">mCaF<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;= 1/40 x 78 = 1,95.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">mCaF<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;cần dùng = 1,95 x 100 / 80 = 2,4375kg.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 10: Làm thế nào để phân biệt dung dịch NaF và dung dịch NaCl?</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Cho dung dịch AgNO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">3</sub>&nbsp;vào 2 mẫu thử chứa dung dịch NaF và dung dịch NaCl, mẫu thử nào có kết tủa trắng NaCl, mẫu thử còn lại không tác dụng là NaF.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">AgNO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">3</sub>&nbsp;+ NaF → không phản ứng (AgF dễ tan trong nước).</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">AgNO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">3</sub>&nbsp;+ NaCl → AgCl↓ + NaNO<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">3</sub>.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><strong style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">Bài 11: Iot bị lẫn tạp chất là NaI. Làm thế nào để loại bỏ tạp chất đó.</strong></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;"><u style="color: rgba(0, 0, 0, 0.87); font-family: Arial, Helvetica, sans-serif; font-size: 16px; text-align: justify;"><em><strong>Giải:</strong></em></u></p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Hòa tan iot bị lẫn tạp chất NaI vào nước, sau đó sục khí clo vào dung dịch để oxi hóa I- thành I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;để tận thu I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;ta đun nóng nhẹ ở áp suất khí quyển, I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;thăng hoa thành hơi màu tím.</p><p style="margin: 0px; padding: 0px 0px 8px; border: 0px; font-variant-numeric: inherit; font-stretch: inherit; font-size: 16px; line-height: inherit; font-family: Arial, Helvetica, sans-serif; color: rgba(0, 0, 0, 0.87); text-align: justify;">Cl<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>&nbsp;+ NaI → 2NaCl + I<sub style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit;">2</sub>.</p>
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