Calculate the solubility of PbCO3 in water at 25 degree C Ks

Calculate the solubility of PbCO_3 in water at 25 degree C. K_sp is equal to 7.4 times 10^-14. Round your answer to 2 significant digits.

Solution

PbCO3 -----------> Pb⁺² + CO3^-2

Ksp = [Pb⁺²][CO3^-2]

[Pb⁺²] = [CO3^-2] = S

Ksp = S²

7.4 x 10^-14 = S²

S = 2.7 x 10^-7 moles/L

S = solubility = 2.7 x 10^-7 moles/L