Для титрования в кислой среде As2O3 массой 0,3 г ушло 10 мл раствора K2Cr2O7 с концентрацией СЭ(K2Cr2O7) = 0,1 моль/л. Чему равна массовая доля As2O3 в навеске?
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16.11.2020 17:53
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