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116问答网 > 除去CO2中的HCl为什么一定要用【饱和】的碳酸氢钠溶液？不饱和会出现什么问题？

除去CO2中的HCl为什么一定要用【饱和】的碳酸氢钠溶液？不饱和会出现什么问题？

老师上课时说离子平衡什么的···又说初中讲深了听不懂·····

2025-03-16 02:23:42

推荐回答（1个）

回答1：

二氧化碳可以溶于水，除杂同时，让二氧化碳更少的溶于水

二氧化碳溶与水，然后部分电离CO2+H2O=可逆=H2CO3=可逆=H+ +HCO3-
碳酸氢钠溶液中完全电离NaHCO3=Na++HCO3-，这样说HCO3-浓度越高，越可以抑制H2CO3的电离，抑制CO2的溶解。那碳酸氢钠饱和溶液中HCO3-浓度最高。

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