Question

Zinc carbonate, ZnCO3(s), dissolves in water to give a solution that is 1.7 multiplied by 10-5 M at 22°C. Calculate Ksp for ZnCO3(s) at this temperature.

Answer 1

Set up an ICE chart, substitute into the Ksp expression and solve for Ksp.
ZnCO3 ==> Zn^2+ + CO3^2-
..x.......0.........0
..........x..........x

Ksp = (Zn^2+)(CO3^2-)
You know solubility ZnCO3. That is x.

Answer 2

Ksp= 2.9×10^-10