兩種含有相同離子的(或)溶於時,它們的溶解度(或等效酸度係數)都會降低。這種現象叫做同離子效應

例子

HC2H3O2(l) ↔ H+(aq) + C2H3O2(aq)
NaC2H3O2(s) → Na+(aq) + C2H3O2(aq)
  • 根據勒沙特列原理,醋酸鈉解離產生的醋酸根離子將抑制醋酸的解離,並將平衡向左移動。溶液的pH將增加,溶液的酸度減少。

參見

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