Chemistry / Unit 10 Chem 1913 short lesson, about 20 seconds
Common-Ion Effect on Solubility
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The idea
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.
In practice
AgCl dissolves less in a solution already containing NaCl than in pure water.
Where people slip
This is not a new rule beyond Le Châtelier — the same Q-vs-K stress applied to solubility.
Your place on the trail
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