Chemistry

What is the molar solubility of Mg(OH)2 in a solution containing 0,10 M NH3 ?

Ksp Mg(OH)2 = 1.2x10^-11
Kp NH3 = 1.8x10^-5

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asked by Kevin
  1. ......Mg(OH)2 ==> Mg^2+ + 2OH^-
    I......solid.......0.......0
    C......solid.......x.......2x
    E......solid.......x.......2x

    Then NH3 + HOH ==> NH4^+ + OH^-
    I....0.1...........0........0
    C....-x............x........x
    E....0.1-x.........x........x

    First, determine the OH^- from the NH3 equation.
    Then Ksp = (Mg^2+)(OH^-)
    You know Ksp.
    (Mg^2+) = x = solubility
    (OH^-) = 2x from the Mg(OH)2 dissolution and OH^- from the NH3 for a total of 2x+OH^- from NH3.
    Solve for x = Mg^2+ = solubility

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