How does adding sodium chloride (NaCl) affect the molar solubility of silver chloride (AgCl) in water?
Answer and explanation
Correct answer: D. Decreases solubility due to the common ion effect
Adding NaCl introduces extra Cl- ions (common ion). By Le Chatelier's principle, the equilibrium AgCl(s) <=> Ag+(aq) + Cl-(aq) shifts left, suppressing the dissolution of AgCl and lowering its solubility.
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