Problem 16-30

Ag2C2O4(s) =	2 Ag+(aq) +	C2O42-(aq)
Solid - x	2x	x

K_sp = [Ag⁺]² [C₂O₄^2-]

k_sp =(2x)² (x) = 4x³

Since the silver concentration is: 2.2×10^-4 = [Ag⁺] = 2x

therefore x = (2.2×10^-4)/2 = 1.1×10^-4

Finally

k_sp = 4x³ = 4(1.1×10^-4)³ = 5.3×10^-12