97. Solving a chemistry problem
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97. Solving a chemistry problem
2. Calculate the percentage of MnO2 in natural pyrolusite if a sample weighing 0.4000 g was treated with dilute sulfuric acid containing 0.6000 g of oxalic acid, and the excess of the latter was titrated with 26.26 ml of 0.1000 M potassium permanganate solution.
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