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13问答网 > 碳酸氢根为什么不会和镁离子双水解

碳酸氢根为什么不会和镁离子双水解

2025-03-16 06:56:35

推荐回答（1个）

回答1：

因为碳酸氢根的呈碱性能力（水解能力）差于碳酸根，而碳酸根恰好能和Mg2+反应生成碳酸镁，在加热条件下水解为Mg（OH）2，说明Mg2+和CO3
2-
已经不能双水解了，所以碳酸氢根不会和镁离子双水解

NH4HCO3=△=NH3 ↑
+
H2O+
CO2↑
即1mol碳酸氢氨分解成2mol气体，式量是
（17+44）/2=30.5
对氢气的相对密度是30.5/2==15.25

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