Hint 10
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The concentration of lead ions (Pb2+) in a sample of polluted water that also contains nitrate ions
(NO3) is determined by adding solid sodium sulfate (Na2SO4) to exactly 500 mL of the water. Calculate
the molar concentration of Pb2+ if 0.00415 g of Na2SO4 was needed for the complete precipitation of
lead ions as PbSO4
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