Solubility is defined to be the mass of solid that may dissolve in a fixed volume of solvent.

a) Consider the following equilibrium:

PbCO3(s) =Pb2+ (aq) + CO32- (aq) ; Ksp=1.46x10^-13

Assuming that this is the only equilibrium that prevails when solid lead (II) carbonate is dissolved in water, calculate the solubility of lead (II) carbonate at 25 C in mg/L.

b) The scenario in a) produces carbonate ions, which are in fact basic. Assuming that all dissolved carbonate ions react with water to form bicarbonate ions, recalculate the solubility of lead (II) sulfate at 25 C in mg/L.

c) Determine, by making the appropriate calculations, whether the solubility of lead (II) carbonate calculated using the approximation in part a) or in part b) is more reasonable.