The ksp of zinc carbonate (znco3 is 1.0 * 10-10. what is the solubility concentration of carbonate ions in a saturated solution at 25°c? 1.4 * 10-5m 7.1 * 10-6m 1.7 * 10-5m 1.0 * 10-5m

Answer is: 1.0 * 10-5m.

Chemical reaction: ZnCO ₃ (s) ⇄ Zn²⁺ (aq) + CO₃²⁻ (aq).

[Zn²⁺] = [CO₃²⁻] = x; equilibrium concentration of zinc cation and carbonate anion.

Ksp = [Zn²⁺] · [CO₃²⁻ ].

1 ·10⁻¹⁰ = x².

x = [CO₃²⁻] = √1·10⁻¹⁰.

[CO₃²⁻] = 1·10⁻⁵ M.

Ksp - solubility product constant is equivalent to equilibrium constant, except this constant is used to determine the solubility of ions of a solid in a solution.

ksp is the product of the soluble ions in the compound. Higher the ksp value, higher the degree of solubility.

ZnCO₃ (s) - - - > Zn²⁺ (aq) + CO₃²⁻ (aq)

n n

ksp = [Zn²⁺][CO₃²⁻]

In the equation equal amounts of ions Zn²⁺ and CO₃²⁻ ions are soluble.

amount of ions soluble = n

ksp is therefore equal to;

ksp = n x n

ksp = n²

ksp = 1 * 10⁻¹⁰ M

therefore

1 * 10⁻¹⁰ M = n²

n = 1 x 10⁻⁵ M

therefore concentration of CO₃²⁻ = 1 x 10⁻⁵ M