The concentration of lead ions (Pb2+)in a sample of polluted water that also contains nitr...

The concentration of lead ions (Pb2+)in a sample of polluted water that also contains nitrate ions () is determined by adding solid sodium sulfate (Na2SO4) to exactly 500 mL of the water, (a) Write the molecular and net ionic equations for the reaction, (b) Calculate the molar concentration of Pb2+ if 0.00450 g of Na2SO4 was needed for the complete precipitation of Pb2+ ions as PbSO4.