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JAMB Chemistry 2000 Question 19

Question 19

Solubility and Solutions

1.0 dm3 of distilled water was used to wash 2.0 g of a precipitate of AgCl. If the solubility product of AgCl is 2.0 × 10−10 mol2dm−6, what quantity of silver was lost in the process?

  1. A.2.029 × 10−3 mol dm−3
  2. B.1.414 × 10−3 mol dm−3
  3. C.2.029 × 10−5 mol dm−3
  4. D.1.414 × 10−5 mol dm−3
Show the answer and explanation

Answer: D (1.414 × 10−5 mol dm−3)

Explanation

Solubility = √Ksp = √(2.0 × 10−10) = 1.414 × 10−5 mol dm−3, so that much silver dissolves in the wash water.