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13问答网 > 现有物质的量浓度和体积均相同的NACN与NACL两种稀溶液

现有物质的量浓度和体积均相同的NACN与NACL两种稀溶液

比较两种溶液中离子总数。要考虑盐的水解

2025-03-16 15:56:25

推荐回答（2个）

回答1：

楼主是高中生吧。如果不考虑活度的话，NaCl在水中是完全电离的。令浓度为xmol/L,则溶液离子总浓度是(2x+2*10^（-7）)mol/L
再看NaCN,为弱酸强碱盐，水中发生水解，产生氢氧根。破坏了水的电离平衡，由于氰酸根离子的水解程度大于水的电离程度，水电离产生的氢氧根忽略不记。氢离子浓度降低，导致离子总浓度小于同浓度的NaCl离子总浓度

回答2：

利方程就好了，，
首先NA=2CL
NA+H=CL+CN+OH
HCN+H=OH
这里电离显示碱性，NA大于CL大于CN大于OH大于HCN大于H

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