Предмет: Химия, автор: vipartga

Какая масса карбоната натрия потребуется для приготовления 1.5 л раствора с массовой долей вещества 5% и плотностью 1.2 г/мл.

Ответы

Автор ответа: tamarabest

дано:
V(р-ра)=1,5л=1500мл
w(р-ра)=5%=0,05
p=1,2г/мл
m(Na2CO3)-?
Решение:
p=m/V
m(р-ра)=p*V=1,2г/мл*1500мл=1800г
m(Na2CO3)=w*m(р-ра)=0,05*1800г=90г
ответ: 90г

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