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At 25^ C , the solubility product of Mg ( OH )₂ is 1.0 10⁻¹¹ . At which pH , will Mg ²⁺ ions start precipitating in the form of Mg ( OH )₂ from a solution of 0.001 M Mg ²⁺ ions ?

Options

  1. A9
  2. B10
  3. C11
  4. D8

Correct answer

B. 10

Step-by-step solution

Mg ²⁺+2 OH ⁻ Mg ( OH )₂ ~K _ sp = [ Mg ²⁺ ] [ OH ⁻ ]^2 [ OH ⁻ ]= K _ sp [ Mg ²⁺ ] =10⁻⁴ p ^ OH =4 and p ^ H =10

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