[Olympiad] The solubility product (Ksp) of Calcium sulfate (CaSO₄) is 2.4 × 10⁻⁵. What is the molar solubility of CaSO₄ in a 0.01 M solution of Na₂SO₄?
- 2.4 × 10⁻³ M
- 4.9 × 10⁻³ M
- 2.4 × 10⁻² M
- 1.2 × 10⁻³ M
📝 Detailed explanation
CaSO₄(s) ⇌ Ca²⁺ + SO₄²⁻. Let solubility be 's'.[Ca²⁺] = s, [SO₄²⁻] = 0.01 + s ≈ 0.01.
Ksp = s * 0.01 = 2.4 × 10⁻⁵ -> s = 2.4 × 10⁻³ M.