89. Solving a chemistry problem

89. Solving a chemistry problem

When analyzing a 0.2435 g sample of dolomite, calcium was isolated in the form of oxalate, for the titration of which, after its dissolution in acid, 42.20 ml of a KMnO4 solution was used, the titer of which for iron was 0.005139 g/ml. What% CaCO3 is in dolomite

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