The solubility product of a salt having general formula MX2

The solubility product of a salt having general formula MX2, in water is 4 × 10–12. The concentration of M2+ ions in the aqueous solution of the salt is

  1. 1.6 × 10–4 M
  2. 1.0 × 10–4 M
  3. 2.0 × 10–6 M
  4. 4.0 × 10–10 M

Answer

MX2(s) → M2+(aq) + 2X-(aq)

               s                2s

Ksp = (s)(2s)2 = 4s3

4 x 10-12 = 4s3

The correct option is B.