A chemist attempts to separate barium ions from lead ions by using the sulfate ion as a precipitating agent.
a) What sulfate ion concentrations are required for the precipitation of BaSO4 and PbSO4 from a solution containing 0.010 M Ba^2+ (aq) and 0.010 M Pb^2+ (aq)?
b) What is the concentration of barium ions when the lead sulfate begins to precipitate?