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15问答网 > 等体积等浓度的醋酸跟醋酸钠混合，溶液PH＜7，醋酸根浓度加氢氧根浓度大于醋酸浓度加氢离子浓度

等体积等浓度的醋酸跟醋酸钠混合，溶液PH＜7，醋酸根浓度加氢氧根浓度大于醋酸浓度加氢离子浓度

2025-03-29 02:56:51

推荐回答（2个）

回答1：

根据电荷守恒：c(Na+)+c(H+) =c(CH3COO-)+c(OH-)，
又因为CH3COONa是强电解质，完全电离，CH3COOH是弱电解质，部分电离，且两者物质的量相等，因此Na+浓度大于H+浓度，所以c(CH3COOH)+c(H+)

回答2：

根据电荷守恒,有CH3COO-+OH-=Na++H+
假设大家原来都是1mol/L,那麼Na+就是1mol/L,而CH3COOH由於要电离,其浓度要小於1mol/L
也就是说,Na+>CH3COOH,所以Na++H+>CH3COOH+H+
即CH3COO-+OH->CH3COOH+H+

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