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Shilajit
Shilajit asked in Science & MathematicsChemistry · 6 years ago

Chemistry Equilibrium Question?

Calculate the concentration of Mg2+ ions and OH- ions in a saturated solution of Mg(OH)2 . The solubility of Mg(OH)2 .The solubility product of Mg(OH)2 is 9.0 x 10-12.

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  • Simonizer1218
    Lv 7
    6 years ago

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

    Let x = [Mg^2+] and then [OH-] = 2x

    Ksp = 9x10^-12 = [Mg^2][OH^-]^2 = (x)(2x)^2 = 4x^3

    x^3 = 2.25x10^-12

    x = [Mg^2+] = 1.3x10^-4 M

    [OH^-] = 2 x 1.3x10^-4 M = 2.6x10^-4 M

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