bài 11: Muối
Câu hỏi trang 51 KHTN-8
<p style="font-weight: 400;"><strong style="font-weight: 640;">Câu hỏi trang 51 KHTN lớp 8:</strong> Trong dung dịch, giữa các cặp chất nào sau đây có xảy ra phản ứng? Viết phương trình hoá học của các phản ứng đó.</p>
<table style="border-collapse: collapse; width: 78.329%; height: 231.375px;" border="1">
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<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p> </p>
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<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>Na<sub>2</sub>CO<sub>3</sub></p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>KCl</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>Na<sub>2</sub>SO<sub>4</sub></p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>NaNO<sub>3</sub></p>
</td>
</tr>
<tr style="height: 57.8438px;">
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>Ca(NO<sub>3</sub>)<sub>2</sub></p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
</tr>
<tr style="height: 57.8438px;">
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>BaCl<sub>2</sub></p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
</tr>
<tr style="height: 57.8438px;">
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>HNO<sub>3</sub></p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
<td style="width: 18.4444%; height: 57.8438px;" width="166">
<p>?</p>
</td>
</tr>
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<p style="font-weight: 400;"><strong style="font-weight: 640;">Trả lời:</strong></p>
<table style="border-collapse: collapse;" border="1">
<tbody>
<tr>
<td width="166">
<p> </p>
</td>
<td width="166">
<p>Na<sub>2</sub>CO<sub>3</sub></p>
</td>
<td width="166">
<p>KCl</p>
</td>
<td width="166">
<p>Na<sub>2</sub>SO<sub>4</sub></p>
</td>
<td width="166">
<p>NaNO<sub>3</sub></p>
</td>
</tr>
<tr>
<td width="166">
<p>Ca(NO<sub>3</sub>)<sub>2</sub></p>
</td>
<td width="166">
<p>×</p>
</td>
<td width="166">
<p>-</p>
</td>
<td width="166">
<p>×</p>
</td>
<td width="166">
<p>-</p>
</td>
</tr>
<tr>
<td width="166">
<p>BaCl<sub>2</sub></p>
</td>
<td width="166">
<p>×</p>
</td>
<td width="166">
<p>-</p>
</td>
<td width="166">
<p>×</p>
</td>
<td width="166">
<p>-</p>
</td>
</tr>
<tr>
<td width="166">
<p>HNO<sub>3</sub></p>
</td>
<td width="166">
<p>×</p>
</td>
<td width="166">
<p>-</p>
</td>
<td width="166">
<p>-</p>
</td>
<td width="166">
<p>-</p>
</td>
</tr>
</tbody>
</table>
<p style="font-weight: 400;">(“×”: xảy ra phản ứng; “-”: không xảy ra phản ứng)</p>
<p style="font-weight: 400;">Phương trình hoá học:</p>
<p style="font-weight: 400;">Ca(NO<sub>3</sub>)<sub>2</sub> + Na<sub>2</sub>CO<sub>3</sub> → CaCO<sub>3</sub> + 2NaNO<sub>3</sub></p>
<p style="font-weight: 400;">Ca(NO<sub>3</sub>)<sub>2</sub> + Na<sub>2</sub>SO<sub>4</sub> → CaSO<sub>4</sub> + 2NaNO<sub>3</sub></p>
<p style="font-weight: 400;">BaCl<sub>2</sub> + Na<sub>2</sub>CO<sub>3</sub> → BaCO<sub>3</sub> + 2NaCl</p>
<p style="font-weight: 400;">BaCl<sub>2</sub> + Na<sub>2</sub>SO<sub>4</sub> → BaSO<sub>4</sub> + 2NaCl</p>
<p style="font-weight: 400;">2HNO<sub>3</sub> + Na<sub>2</sub>CO<sub>3</sub> → 2NaNO<sub>3</sub> + CO<sub>2</sub> + H<sub>2</sub>O.</p>
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