Problem: A 50.00 mL sample containing La3+ was treated with sodium oxalate to precipitate La2(C­2O4)3, which was washed, dissolved in acid, and titrated with 18.04 mL of 0.006363 M KMnO4. Calculate the molarity of La3+ in the unknown. 2 MnO4– + 5 H2C2O4 + 6 H+ → 2 Mn2+ + 10 CO2 + 8 H2O

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A 50.00 mL sample containing La3+ was treated with sodium oxalate to precipitate La2(C­2O4)3, which was washed, dissolved in acid, and titrated with 18.04 mL of 0.006363 M KMnO4. Calculate the molarity of La3+ in the unknown. 

2 MnO4 + 5 H2C2O4 + 6 H+ → 2 Mn2+ + 10 CO2 + 8 H2O

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