Chemistry / Chem 1913 · Atom · ~20 seconds
Common-Ion Effect on Solubility
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The common-ion effect lowers a solid's solubility when a solution already holds one of its ions, raising Q above Ksp and shifting the equilibrium back toward undissolved solid.
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AgCl dissolves less in a solution already containing NaCl than in pure water.
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This is not a new rule beyond Le Châtelier — the same Q-vs-K stress applied to solubility.