Question

The solubility of an ionic compound MX (molar mass = 188 g / mol) is 0.000165 g / L. What is Ksp for this compound?

Answer 1

solubility = 0.000165 g / L

              = 0.000165 g / L / 188 g / mol

              = 8.78 x 10^-7 mol / L

8.78 x 10^-7 mol / L      = S

MX ------------------> M+ + X-

                            S          S

Ksp = [M+] [X-]

Ksp = (8.78 x 10^-7 )^2

Ksp = 7.70 x 10^-13