STANDARD Chemistry Solubility Product MCQ Question
What is the pH at which Mg(OH)₂ begins to precipitate from a solution containing 0.1 M Mg²⁺ ions? [Kₛₚ for Mg(OH)₂ = 1.0 × 10⁻¹¹]
10
9
8
7
Correct Answer
Detailed Explanation
The solubility product expression for Mg(OH)₂ is [Mg²⁺][OH⁻]² = 1.0 × 10⁻¹¹. Given [Mg²⁺] = 0.1 M, we find [OH⁻] = 10⁻⁵ M. The pOH is 5, so the pH is 9.
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