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Консультация № 185762
Обсуждение
Неизвестный
05.04.2012, 22:45
общий
Правильный ли вопрос:
"Сколько надо взять 20% (по массе) р-ра гидроксида калия, чтобы при добавлении его к 1 кг 50% (по массе) раствора получился 25% (по массе) раствор"?
"Сколько надо взять 20% (по массе) р-ра гидроксида калия, чтобы при добавлении его к 1 кг 50% (по массе) раствора получился 25% (по массе) раствор"?
06.04.2012, 12:49
общий
это ответ
Здравствуйте, Посетитель - 386361!
Пусть x - искомое количество килограмм 25-процентного раствора.
Что имеется в виду, когда говорится, что раствор y-процентный? Что отношение массы "полезного вещества" к общей массе есть y/100.
Общая масса после того, как слили вместе 50-процентный и 20-процентный = 1+x кг.
А масса гидроксида калия в этой смеси = 0,2*x + 0,5*1 кг.
Причём известно, что доля гидроксида калия - 25%.
Т.о.
,
откуда
.
Т.е. надо взять 5 кг 20-процентного раствора.
Пусть x - искомое количество килограмм 25-процентного раствора.
Что имеется в виду, когда говорится, что раствор y-процентный? Что отношение массы "полезного вещества" к общей массе есть y/100.
Общая масса после того, как слили вместе 50-процентный и 20-процентный = 1+x кг.
А масса гидроксида калия в этой смеси = 0,2*x + 0,5*1 кг.
Причём известно, что доля гидроксида калия - 25%.
Т.о.
,откуда
.Т.е. надо взять 5 кг 20-процентного раствора.
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