Calculate the solubility (in M) of cobalt (II) hydroxide, Co (OH) 2 (s) in H2O. Ksp = 1.10*10-16 at a specific temperature.

Question

Lilly Villarreal

Chemistry

28 February, 08:13

Calculate the solubility (in M) of cobalt (II) hydroxide, Co (OH) 2 (s) in H2O. Ksp = 1.10*10-16 at a specific temperature.

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Answers (1)

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Aliana Trevino · Answer 1

3.018 x 10⁻⁶ M.

Explanation:

Co (OH) ₂ dissociates in solution according to the equation:

Co (OH) ₂ → Co²⁺ + 2OH⁻.

∵ Ksp = [Co²⁺][OH⁻]² = (s) (2s) ² = 4s³.

∴ 4s³ = 1.10 x 10⁻¹⁶.

∴ s³ = 1.10 x 10⁻¹⁶/4 = 2.75 x 10⁻¹⁷.

∴ s = ∛ (2.75 x 10⁻¹⁷) = 3.018 x 10⁻⁶ M.