What is observed when a few crystals of NaCl are added to a saturated solution of AgCl?
Correct answer B. Some AgCl precipitates because its solubility is lowered
Explanation
NaCl supplies extra Cl⁻, a common ion. The ionic product [Ag⁺][Cl⁻] then exceeds Ksp, so the equilibrium shifts left and AgCl precipitates. This is the common ion effect.
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