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рассчитайте массу соли и воды, необходимых для приготовления 25 г 2%-го раствора. найдите w раствора, если к нему добавили 75 мл воды.
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Ответы 1
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m(соли)= 2%/100% * 25г = 0,02 * 25г = 0,5гm(воды)= 25г - 0.5 = 24,5гw=m(чистой соли из пункта 1)/m(всего раствора соли) * 100%Т.к. добавляли только воду, масса чистой соли не изменилась и осталась равной 0,5г.Т.к. плотность воды равна её массе, то 75мл = 75г.В итоге имеем: w=0,5/25г+75г * 100% = 0,5%
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Автор:
gunnar - 6 лет назад
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