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Консультация № 109796
17.11.2007, 08:27
0.00 руб.
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1
1
Зравствуйте! Вот такая задача:
Какой объем раствора карбоната калия с массовой долей 0,1 и плотностью 1,09 г/мл требуется для приготовления 250 мл 0,6н. раствора?
Буду благодарен за решение.
Какой объем раствора карбоната калия с массовой долей 0,1 и плотностью 1,09 г/мл требуется для приготовления 250 мл 0,6н. раствора?
Буду благодарен за решение.
Обсуждение
Неизвестный
17.11.2007, 09:14
общий
это ответ
Здравствуйте, piit!
Найдем количество карбоната калия в требуемом растворе.
n = 0.25 * 0.6 = 0.15 моль*экв = 0.075 моль. Масса 0.075 * (39*2 + 12 + 3*16) = 10.35 г.
Значит, в исходном растворе должно быть 10.35 г карбоната калия. Следовательно, масса раствора 10.35/0.1 = 103.5 г, а объем - 103.5/1.09 = 95 мл.
Ответ: 95 мл.
Найдем количество карбоната калия в требуемом растворе.
n = 0.25 * 0.6 = 0.15 моль*экв = 0.075 моль. Масса 0.075 * (39*2 + 12 + 3*16) = 10.35 г.
Значит, в исходном растворе должно быть 10.35 г карбоната калия. Следовательно, масса раствора 10.35/0.1 = 103.5 г, а объем - 103.5/1.09 = 95 мл.
Ответ: 95 мл.
Форма ответа
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