Practice question

MCQ

Question

The Ksp of Mg(OH)2 is 1.8 × 10⁻¹¹ . What is the solubility of Mg(OH)2 in pure water in mol/L?

Options

Choose one · Correct answer highlighted

1.65 × 10⁻⁴ Correct 3.0 × 10⁻⁴ 4.5 × 10⁻¹² 9.0 × 10⁻⁶

Explanation

For Mg(OH)2 <=> Mg²⁺ + 2OH- , Ksp = [Mg²⁺][OH-]² = S (2S)² = 4S³ = 1.8 × 10⁻¹¹ . Solving, S³ = (1.8 × 10⁻¹¹/4) = 4.5 × 10⁻¹² , S ≈ 1.65 × 10⁻⁴ .

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