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Консультация № 158800
26.01.2009, 13:25
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Уважаемые эксперты, надеюсь на вашу помощь в решении следующей задачи. Составьте электронные уравнения процессов, происходящих на графитовых электродах при электролизе раствора KBr. Какая масса вещества выделяется на катоде и аноде, если электролиз проводить в течение 1 ч 35 мин при силе тока 15 А?
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Неизвестный
26.01.2009, 18:36
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это ответ
Здравствуйте, Орехов Роман Александрович!
Графитовые электроды являются инертными, поэтому их материал с раствором при электролизе не реагирует. Отсюда процессы, происходящие на электродах, следующие:
анод) окисление бромид-ионов
2Br- - 2e = Br2
катод) восстановление молекул воды
2H2O + 2e = H2 + 2OH-
Количество электричества, проходящее через раствор:
q = It = (60 + 35) * 60 * 15 = 85500 Кл. Выход по току считаем равным 100%, так как не указано иного. Тогда количество эквивалентов, выделяющееся на аноде и катоде(оба количества равны между собой по закону эквивалентов), равно:
n = q/F = 85500 Кл / 96485 Кл/моль*экв = 0.88615 моль*экв.
На аноде выделяется молекулярный бром. Молярная масса его эквивалента равна 80 г/моль*экв, масса брома равна m = 80 * 0.88615 = 70.89 г.
На катоде выделяется водород. Молярная масса эквивалента его равна 1 г/моль*экв. Масса водорода равна 1*0.88615 = 0.88615 г.
С уважением, Товарищ Бородин
Графитовые электроды являются инертными, поэтому их материал с раствором при электролизе не реагирует. Отсюда процессы, происходящие на электродах, следующие:
анод) окисление бромид-ионов
2Br- - 2e = Br2
катод) восстановление молекул воды
2H2O + 2e = H2 + 2OH-
Количество электричества, проходящее через раствор:
q = It = (60 + 35) * 60 * 15 = 85500 Кл. Выход по току считаем равным 100%, так как не указано иного. Тогда количество эквивалентов, выделяющееся на аноде и катоде(оба количества равны между собой по закону эквивалентов), равно:
n = q/F = 85500 Кл / 96485 Кл/моль*экв = 0.88615 моль*экв.
На аноде выделяется молекулярный бром. Молярная масса его эквивалента равна 80 г/моль*экв, масса брома равна m = 80 * 0.88615 = 70.89 г.
На катоде выделяется водород. Молярная масса эквивалента его равна 1 г/моль*экв. Масса водорода равна 1*0.88615 = 0.88615 г.
С уважением, Товарищ Бородин
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