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Question 600432
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Chemical and Ionic Equilibrium: Solubility effect of pH MCQ

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Solubility effect of pHHardQuestion 600432

Question

The solubility of Mg(OH)₂ (Ksp = 1.2×10⁻¹¹) increases when:
  1. A
    The solution is made more basic
  2. B
    The solution is made more acidic
    Correct
  3. C
    NaCl is added
  4. D
    Temperature decreases

Correct answer

The solution is made more acidic

Explanation

Adding acid decreases [OH⁻] → equilibrium Mg(OH)₂ ⇌ Mg²⁺ + 2OH⁻ shifts right → more dissolves. Ksp for Mg(OH)₂ depends on [Mg²⁺][OH⁻]² = 1.2×10⁻¹¹.

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