Question

If x represents the molar solubility of Ca(OH)2 , what is the correct equation for the K sp ?

Ksp=x^2
Ksp=2x^3
Ksp=4x^3
Ksp=x^3

Answer 1

Ksp = 4x³

Step-by-step explanation:

Step 1: Write the reaction for the solution of calcium hydroxide

Ca(OH)₂(s) ⇒ Ca²⁺(aq) + 2 OH⁻(aq)

Step 2: Make an ICE chart

Let "x" be the molar solubility of calcium hydroxide.

Ca(OH)₂(s) ⇒ Ca²⁺(aq) + 2 OH⁻(aq)

I 0 0

C +x +2x

E x 2x

Step 3: Write the expression for the solubility product constant (Ksp)

The solubility product constant is equal to the product of the concentrations of the products raised to their stoichiometric coefficients.

Ksp = [Ca²⁺] × [OH⁻]² = x × (2x²) = x × 4x² = 4x³