139. Задачка по химии №013 942

For titration of 25.0 cm3 of 0.1 N KMnO4 solution, 5.10 cm3 of sodium nitrite solution is consumed, obtained by dissolving a weighed portion of 1.3074 g of this substance in 500.0 cm3 of solution. Calculate the mass fraction of sodium nitrite in the sample.

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