Common ion effect
Adding NaCl to a saturated solution of AgCl will:
Answer D: explanation for every choice
A
A common ion decreases solubility.
B
Ksp changes only with temperature.
C
Added Cl⁻ is part of the AgCl equilibrium, so it has an effect.
D
Correct. Extra Cl⁻ makes Q exceed Ksp, shifting the equilibrium toward solid AgCl.
TakeawayA common ion pushes Q above Ksp and reduces solubility.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID cp43.