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The solubility product of Mg(OH)2 is 1.2 x 10^-11. What minimum OH- concentration must be attained (for example, by adding NaOH) to decrease the Mg concentration in a solution of Mg(NO3)2 to less than 1.0 x 10^-10 M (molar)?

  • chem -

    Mg(OH)2 ==> Mg^+2 + 2OH^-

    Ksp = (Mg^+2)(OH^-)^2 = 1.2 x 10^-11

    You know (Mg^+) and Ksp, solve for (OH^-).
    It's that simple.

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