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JAMB Chemistry 1999 Question 23

Question 23

Solubility and Solutions

The solubility product of Cu(IO3)2 is 1.08 x 10−7. Assuming that neither ions react appreciably with water to form H+ and OH−, what is the solubility of this salt?

  1. A.2.7 x 10−8 mol dm−3
  2. B.9.0 x 10−8 mol dm−3
  3. C.3.0 x 10−3 mol dm−3
  4. D.9.0 x 10−3 mol dm−3.
Show the answer and explanation

Answer: C (3.0 x 10−3 mol dm−3)

Explanation

If the solubility is s, [Cu2+] = s and [IO3−] = 2s, so Ksp = 4s3 = 1.08 × 10−7. s3 = 2.7 × 10−8, s = 3.0 × 10−3 mol dm−3.