The Solubility Product Constant for zinc phosphate is 9.1x10^-33 . The maximum amount of zinc phosphate that will dissolve in a 0.118 M zinc acetate solution is ___ M.

Answer 1

Common ion effect.

Zn₃(PO₄)₂(s) <==> 3Zn²⁺(aq) + 2PO₄^3-(aq)

[Zn2+] = 0.118 M

[PO₄^3-] = x

Ksp = [Zn²⁺]³[PO₄^3-]²

9.1x10^-33 = [0.118]³[x]²

x² = 5.5x10^-30

x = 2.4x10^-15 M