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Common-Ion Effect

AP Chemistry· difficulty 3/5

A saturated solution of AgCl is in contact with solid AgCl. Solid NaCl is added.

AgCl(s) <-> Ag+(aq) + Cl-(aq) add NaCl [Cl-] increases shift <- solubility decreases

What happens to the solubility of AgCl when NaCl is added?

  • A

    Decreases because Ksp decreases

  • B

    Decreases due to common-ion effect

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  • C

    Unchanged because Ksp is constant

  • D

    Increases

Explanation

Adding Cl- (common ion) shifts AgCl(s) <-> Ag+ + Cl- to the left, decreasing the solubility of AgCl. Ksp is constant.

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