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MHT CET20226 Aug 2022Morning ShiftChemistryIonic EquilibriumActual

What is the pH at which Mg ( OH )₂ starts to precipitate from a solution containing 0.1 M Mg ²⁺ ions? (Given Ksp for Mg ( OH )₂=1.0 10⁻¹¹ )

Options

  1. A7
  2. B4
  3. C6
  4. D9

Correct answer

D. 9

Step-by-step solution

aligned & K _ sp = ( Mg ⁺² ) [ OH ⁻ ]^2 & 1 10⁻¹¹=(0.1) [ OH ⁻ ]^2 & [ OH ⁻ ]=10⁻⁵ M & pOH =5 ; pH =9 aligned

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