What happens to the solubility of silver chloride (AgCl) when sodium chloride (NaCl) is added to the saturated aqueous solution?
Answer and explanation
Correct answer: C. AgCl solubility decreases due to the common ion effect of chloride ions
According to Le Chatelier's principle and the common ion effect, adding NaCl supplies additional Cl- ions to the solution. To maintain Ksp = [Ag+][Cl-], the equilibrium AgCl(s) <=> Ag+(aq) + Cl-(aq) shifts to the left, causing Ag+ to precipitate as AgCl and decreasing the molar solubility of AgCl.
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