alleryAdding NaCl (sodium chloride) to a saturated AgCl solution will:
AIncrease AgCl solubility (more dissolves)
BHave no effect on AgCl solubility
CCause complete dissolution of AgCl
DDecrease AgCl solubility (common-ion effect)
Answer & Solution
Correct answer: D. Decrease AgCl solubility (common-ion effect)
NaCl provides extra Cl- ions (common to AgCl equilibrium).
By Le Chatelier, equilibrium AgCl ⇌ Ag+ + Cl- shifts BACKWARD, decreasing AgCl solubility.
This is the common-ion effect.
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