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Solution Stoichiometry (Assignment)

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1.           How much mercury(II) sulfide would form if 50.0 mL of a 0.010 M mercury(II) nitrate solution is allowed to react with 20.0 mL of a 0.10 M sodium sulfide solution? What is the molarity of the resulting sodium nitrate solution that forms?

2.           A 1.9348 g sample of a mixture of CaCl2 and NaCl was dissolved and analyzed for Ca2+ by using excess Na2C2O4 to precipitate the Ca2+ as CaC2O4. The CaC2O4 was then dissolved in sulfuric acid and the resulting H2C2O4 was titrated with 37.68 mL of 0.1019 M KMnO4 solution to reach the end point. Calculate the mass percent of CaCl2 in the original sample.

Balanced equation:

2KMnO4(aq) + 5H2C2O4(aq) + 3H2SO4(aq) à 2MnSO4(aq) + K2SO4(aq) + 10CO2(g) + 8H2O(l)

Net Ionic Equation:

2MnO4-(aq) + 5H2C2O4(aq) + 6H+(aq) à 2Mn2+(aq) + 10CO2(g) + 8H2O(l)

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