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高中化学，为什么越稀越水解？

2025-03-16 20:46:04

推荐回答（1个）

回答1：

水解反应是可逆反应，有一个平衡常数，
对于反应：A- +H2O===HA+OH-
K=[HA][OH-]／[A- ]
对于反应：B+ +H2O===BOH+H+
K=[BOH][H+]／[B+]
拿第一的例子，A-是弱酸阴离子，假设是醋酸根离子，醋酸钠溶液呈碱性，加水后变稀，溶液浓度下降，碱性下降，所以溶液中（OH-）的溶度就会下降，但K是常数，所以[HA]/[A-]变大，水解程度上升。

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