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多离子盐溶液中晶体的析出属初中所学内容,但初中所学不能满足于高考的要求,因此高中阶段有必要加深.多离子溶液中的任何一种阳离子与任何一种阴离子相结合都可构成为溶液的一种溶质,若忽略同离子效应和盐效应(即假定盐类共存时不影响各自的溶解度),当溶液中各离子浓度相等时,不论蒸发还是降温,溶解度最小的溶质首先析出,且析出盐的阳离子(或阴离子)与溶液中的其他阴离子(或其他阳离子)不会结
The precipitation of crystals in a multi-ion salt solution is what junior high school learns, but junior high school can’t satisfy the requirements of the college entrance examination, so it is necessary to deepen the high school stage. Any cation in a multi-ion solution can be combined with any kind of anion. A solute that is composed of a solution ignoring both isoionic and salt effects (ie, assuming salt coexistence does not affect their respective solubility), when the concentrations of the ions in the solution are equal, the solute with the lowest solubility first precipitates regardless of evaporation or cooling. And the cation (or anion) that precipitates the salt will not bind with other anions (or other cations) in the solution.