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Ionic Equilibrium

  1. Sep 23, 2010 #1
    1. The problem statement, all variables and given/known data

    Caculate the pH at which Magnesium Hydroxide begins to precipitate
    from a solution containing 0.1M Mg2+ ion? Ksp=10^-11

    2. Relevant equations

    3. The attempt at a solution

    I did not understand why Ksp is given.
    Since the concentration of Mg2+ is 0.1, concentration of OH- will be 0.2 (by stoichiometry).
    Moreover there is no other source of OH-.
    Where am I wrong?
  2. jcsd
  3. Sep 23, 2010 #2


    User Avatar

    Staff: Mentor

    You start with a solution that contains Mg2+ (from whatever source) and you add base till precipitation starts.

    Your ability to understand questions in unintended way is incredible :rofl:

  4. Sep 23, 2010 #3
    LOL. May be it is because I think too much behind a problem :wink:
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