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72. В мерной колбе емкостью 250,0 мл растворена навеска 1,4425 г технического нитрита натрия. На титрование 20,00 мл этого раствора израсходовано 25,00 мл раствора КМnO4 с титром 0,001520 г/мл. Определите процентное содержание NaNO2 в образце.
