Topic Details (Notes format)

Common Ion Effect

Subject: Chemistry

Book: General Chemistry

The common ion effect states that the solubility of an ionic compound decreases in the presence of a common ion. For instance, adding NaCl to a solution of AgCl reduces its solubility because [Cl–] is already elevated. This effect is used in qualitative analysis (selective precipitation) and buffer solutions, where the addition of a conjugate base or acid helps stabilize pH.

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