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Консультация № 178123
30.04.2010, 14:39
35.95 руб.
0
2
1
Доброго времени суток, уважаемые эксперты!
Прошу вашей помощи в решении следующей задачи.
Задача.
Сколько граммов хлорида алюминия нужно взять для приготовления 2л 0,5н раствора? Рассчитать молярную концентрацию раствора.
Заранее спасибо.
Прошу вашей помощи в решении следующей задачи.
Задача.
Сколько граммов хлорида алюминия нужно взять для приготовления 2л 0,5н раствора? Рассчитать молярную концентрацию раствора.
Заранее спасибо.
Обсуждение
Неизвестный
30.04.2010, 15:18
общий
[b]Bostman:[/b]
поясните пожалуйста мне данное выражение
Код:
2л 0,5н раствора
поясните пожалуйста мне данное выражение
Неизвестный
30.04.2010, 15:37
общий
это ответ
Здравствуйте, Botsman.
0,5 н раствор – это раствор, молярная концентрация эквивалента которого равна 0,5 моль-экв/л. Устаревшее, но часто применимое название – нормальная концентрация.
Молярная концентрация эквивалента – содержание молей эквивалента в 1 л раствора.
Молярная масса эквивалента хлорида алюминия равна 1/3 его молярной массы, так как валентность алюминия равна 3.
Мэ=133,33/3= 44,44
Для приготовления раствора нужно взять m= Cн*Mэ*V = 0,5* 44,44*2 = 44,44 г
0,5 н раствор – это раствор, молярная концентрация эквивалента которого равна 0,5 моль-экв/л. Устаревшее, но часто применимое название – нормальная концентрация.
Молярная концентрация эквивалента – содержание молей эквивалента в 1 л раствора.
Молярная масса эквивалента хлорида алюминия равна 1/3 его молярной массы, так как валентность алюминия равна 3.
Мэ=133,33/3= 44,44
Для приготовления раствора нужно взять m= Cн*Mэ*V = 0,5* 44,44*2 = 44,44 г
5
Спасибо!
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