The solubility of PbCO3, in water at 25 °c is measured to be 7.3 x 10-5 g/L. Use this information to calculate Ksp for PbCO3.

Question

The solubility of PbCO₃, in water at 25 °c is measured to be 7.3 x 10^-5 g/L. Use this

information to calculate K_sp for PbCO₃.

Round your answer to 2 significant digits.

Answer 1

PbCO₃(s) <==> Pb²⁺(aq) + CO₃^2-(aq)

Ksp = [Pb²⁺][CO₃^2-]

molar mass PbCO₃ = 267 g / mole

[Pb²⁺] = [CO₃^2-] = 7.3x10^-5 g / L x 1 mol / 267 g = 2.73x10^-7 mol / L

Ksp = [2.73x10^-7][2.73x10^-7]

Ksp = 7.5x10^-14