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Консультация № 160185
11.02.2009, 11:45
0.00 руб.
0
1
1
Здравствуйте, уважаемые Эксперты. Помогите пожалуйста с решением следующей задачи:
Рассчитать время лужения медной платы в электролите, содержащем хлорид олова (II). Площадь платы 10 см^2, сила тока 0,5 А. Толщина слоя олова 20 мкм. Выход по току 100%.
Спасибо за внимание.
Рассчитать время лужения медной платы в электролите, содержащем хлорид олова (II). Площадь платы 10 см^2, сила тока 0,5 А. Толщина слоя олова 20 мкм. Выход по току 100%.
Спасибо за внимание.
Обсуждение
Неизвестный
11.02.2009, 14:00
общий
это ответ
Здравствуйте, Ushastik1985!
Из известного значения площади платы и толщины оловянного слоя найдем количество олова.
VSn = 2 * 10 см2 * 2 * 10-3 см = 4 * 10-2 см3.
Из справочника узнаем плотность олова - для белого олова плотность 7.29 г/см3. Таким образом, масса олова:
mSn = 7.29 г/см3 * 0.04 см3 = 0.2916 г.
Количество олова:
nSn = 0.2916 г / 59.35 г/моль*экв = 4.91 * 10-3 моль*экв.
Теперь требуется узнать количество заряда, прошедшее через раствор. Вообще оно равно q = I*t, где t - время, I - сила тока. С количеством эквивалентов восстановленного олова оно связано таким образом:
q = I * t = n * F / [$969$], где F = 96485 Кл/моль*экв - число Фарадея, [$969$] - выход по току(далее я его не указываю, так как он равен 1 или 100%).
Отсюда t = n * F / I = 0.00491 моль*экв * 96485 Кл / моль*экв / 0.5 А = 948 с.
Ответ: 948 с = 15.8 мин.
С уважением, Товарищ Бородин
Из известного значения площади платы и толщины оловянного слоя найдем количество олова.
VSn = 2 * 10 см2 * 2 * 10-3 см = 4 * 10-2 см3.
Из справочника узнаем плотность олова - для белого олова плотность 7.29 г/см3. Таким образом, масса олова:
mSn = 7.29 г/см3 * 0.04 см3 = 0.2916 г.
Количество олова:
nSn = 0.2916 г / 59.35 г/моль*экв = 4.91 * 10-3 моль*экв.
Теперь требуется узнать количество заряда, прошедшее через раствор. Вообще оно равно q = I*t, где t - время, I - сила тока. С количеством эквивалентов восстановленного олова оно связано таким образом:
q = I * t = n * F / [$969$], где F = 96485 Кл/моль*экв - число Фарадея, [$969$] - выход по току(далее я его не указываю, так как он равен 1 или 100%).
Отсюда t = n * F / I = 0.00491 моль*экв * 96485 Кл / моль*экв / 0.5 А = 948 с.
Ответ: 948 с = 15.8 мин.
С уважением, Товарищ Бородин
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