Calculate the value of Ksp at this temperature.

Question

At 25 ^oC the solubility of magnesium fluoride is 1.17 x 10^-3 mol/L. Calculate the value of K_sp at this temperature. Give your answer in scientific notation to 2 SIGNIFICANT FIGURES

Answer 1

The solubility is molar solubility, which is the "x" in the ICE Table.

MgF₂ (s) <----> Mg⁺² (aq) + 2F^- (aq)

Ksp = [Mg⁺²]*[F^-]²

Ksp = x*(2x)² = 4x³

Ksp = 4*(1.17 x 10^-3)³ = 4.68 x 10^-9