99. Solving a chemistry problem

99. Solving a chemistry problem

5. A portion of technical sodium nitrite weighing 0.5025 g was dissolved in water. The volume of the solution was adjusted to 250 ml. for titration of 25 ml of a solution of potassium permanganate with T=0.2501 g/ml, 21 ml of the resulting solution were used. Calculate the mass fraction of NaNO2 in the sample

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