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Homework Help: Finding K_sp

  1. Mar 22, 2006 #1
    The solubility of M2X3 (as M3+ and X2-) in water at 298K is 4.12 x 10-4 M. Calculate Ksp for M2X3.

    M2X3 <--> 2M3+ + 3X2-

    K_sp = [M3+]^2*[X2-]^3

    Now Molarity of M3+ = (4.12 x 10-4) M2X3*(2 mol M3+/1 mol M2X3) = 8.24E-4 mol = Molarity

    Molarity X2- = (4.12 x 10-4) M2X3*(3 mol X2-/1 mol M2X3) = 1.236E-3 mol = molarity

    K_sp = [8.24E-4 M]^2*[1.236E-3]^3 = 1.28E-15

  2. jcsd
  3. Mar 22, 2006 #2


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