Предмет: Химия, автор: nargis19970213

Сколько граммов гидроксида калия необходимо добавить к 140 г 10%-ого раствора, чтобы образовался 20 %-ый раствор?

Ответы

Автор ответа: iosiffinikov

5

Составляем уравнение (14+х)/(140+х)=1/5
Ответ х=17,5. Надо добавить 17,5 г гидроксида калия

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