548. Determine the mass of iron wire, which was dissolved in sulfuric acid, after which the mixture of iron ions was reduced to Fe2, the solution was transferred to a volumetric flask with a capacity of 250.0 ml, an aliquot of the solution of 25.00 ml was taken and titrated with a 0.1000 M solution of KMnO4, using 40.00 ml of titrant.

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