Calculating Ksp for M2X3: Solubility and Equilibrium Calculation

[Soaring Crane]

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

Thanks.

 

[Borek]

OK