The concentration of Lead ions (Pb 2+) in a sample of polluted water is determined by adding solid sodium sulfate (Na2SO4) to the sample. The net ionic equation of the reaction is
Pb2+ (aq) + SO4 2-(aq) -> PbSO4(s)
Explain how many moles of Pb2+ did the sample contain if .00375 g of Na2SO4 was needed for the complete precipitation of lead ions as PbSO4