Предмет: Химия, автор: SoHyun

Вычислите молярность 28%-ного раствора HNO3 (p=1.167 г/см3.)

Ответы

Автор ответа: vikuka

Дано:
ω%(HNO₃) = 28%
ρ(HNO₃) = 1,167 г/см³
Найти: См(HNO₃) -?
Решение: возьмем 1л (1000 мл) раствора HNO₃ , отсюда масса раствора HNO₃ равна m(HNO₃) = V*ρ = 1000 мл * 1,167 г/мл = 1167 г
Найдем массу растворенного вещества:
m(HNO₃)в-ва = [m(р-ра) * ω%] / 100% = 1167*28/100 = 326,76 г
М(HNO₃) = 63 г/моль,
См(HNO₃) = m(в-ва) / [V*M] = 326.76г / (1л *63 г/моль) = 5,19 моль/л
Ответ: См(HNO₃) = 5,19 моль/л или 5,19М

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