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能用澄清石灰水鉴别Na2CO3和NaHCO3？为什么

2025-03-17 00:29:19

推荐回答（2个）

回答1：

不可以用澄清石灰水区分,原因是两者都会生成CaCO3白色沉淀,现象相同.
方程式：Na2CO3 + Ca(OH)2 == CaCO3(沉淀) + 2NaOH
2NaHCO3 + Ca(OH)2 == CaCO3(沉淀) + Na2CO3 + 2H2O

回答2：

碳酸钠和石灰水里的氢氧化钙反应生成不溶于水的碳酸钙沉淀；而碳酸氢钙和石灰水反应也会生成沉淀，但是比较少，现象不同。

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