Question 4.12: Determining the Amount of a Species by Gravimetric Analysis ...

General Chemistry

Determining the Amount of a Species by Gravimetric Analysis

A 1.000-L sample of polluted water was analyzed for lead(II) ion, $Pb^{2+}$ , by adding an excess of sodium sulfate to it. The mass of lead(II) sulfate that precipitated was 229.8 mg. What is the mass of lead in a liter of the water? Give the answer as milligrams of lead per liter of solution.

PROBLEM STRATEGY

All of the lead in the water solution is precipitated as lead(II) sulfate, $PbSO_4$ . If you determine the percentage of lead in $PbSO_4$ , you can calculate the quantity of lead in the water sample.

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