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138. Solving a chemistry problem

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92. To what volume is it necessary to bring a solution of 2.5 g of a technical sample of sodium sulfate containing 40.3% sodium sulfite so that 12.79 cm3 of KMnO4 solution with C (1 / 5KMnO4) = 0.1000 mol is spent on titration of 20.00 cm3 of this solution / dm3.
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