难溶无机盐在水中的溶解过程是一个非常复杂的问题。本文对其溶解度S和溶度积K_ 从理论上进行了分析和探讨,指出在一般情况下二者之间并不存在必然的对应关系,只是在某些特殊情况下可以利用溶度积来对溶解度作些近似计算。本文还导出了在只考虑难溶无机盐M_aX_b中阴离子X~(n-)水解和溶液中离子强度影响不可忽略这两种情况下求解难溶无机盐在水中溶解度的两个基本方程式,对某些难溶无 Dissolving insoluble salts in water is a complex problem. In this paper, the solubility and solubility product of K_ K_ theoretically analyzed and discussed, pointed out that in general there is no necessary correspondence between the two, but in some special cases can use the solubility product to Approximate solubility for some calculations. In this paper, we also derive two basic equations for solving the solubility of insoluble inorganic salts in water when considering only the X ~ (n-) anion of the insoluble inorganic salt M_aX_b and the non-negligible effect of ionic strength in the solution. Some insoluble