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Example: To determine amount of lead in a water sample. Assume lead occurs in water as lead(II) ion Pb 2+ When add Na 2 SO 4 to solution containing Pb 2+ PbSO 4 precipitates from the solution as a white colored fine crystalline solid Pb 2+ (aq) + SO 4 2- (aq) PbSO 4 (s)
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Example: To determine amount of lead in a water sample. Assume lead occurs in water as lead(II) ion Pb2+ When add Na2SO4 to solution containing Pb2+ • PbSO4 precipitates from the solution as a white colored fine crystalline solid Pb2+(aq) + SO42-(aq) PbSO4(s) • Separate PbSO4 from solution by filtration