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Консультация № 187224
24.03.2013, 21:04
161.81 руб.
0
3
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Навеска 0,9010 сплава Ag и Ni растворена в HNO3 и разбавлена в мерной колбе до 500 мл. К 50,0 мл полученного раствора добавлено 25,0 мл 0,20 М раствора KCl. Избыток ионов Ag в фильтрате оттитрован был после отделения осадка 4,05 мл 0,25 М раствора NH4CNS. Определить процентное содержание Ag в сплаве.
Навеска 0,9010 сплава Ag и Ni растворена в HNO3 и разбавлена в мерной колбе до 500 мл. К 50,0 мл полученного раствора добавлено 25,0 мл 0,20 М раствора KCl. Избыток ионов Ag в фильтрате оттитрован был после отделения осадка 4,05 мл 0,25 М раствора NH4CNS. Определить процентное содержание Ag в сплаве.
Обсуждение
Неизвестный
30.03.2013, 16:48
общий
Для начала напишем реакцию последней стадии:
АgNO3 + NH4SCN => AgSCN + NH4NO3
n(NH4SCN ) который ушел на титрование = 0.25 моль/л* 0.00405 л = 0.0010125 моль
n(АgNO3) который прореагировал = 0.0010125 моль
Далее посчитаем предыдущую стадию:
АgNO3 + KCl => AgCl + KNO3
n(KCL) = 0.2 моль/л * 0.025 л = 0.005 моль
n(KCL) = n(АgNO3) = 0.005 моль
n(АgNO3) общего = 0.005 моль + 0.0010125 моль = 0.0060125 моль
m(Ag) в сплаве = 0.0060125 моль * 108 г/моль = 0.64935 г
w(Ag) в сплаве = (0.64935 г/0.9010г)*100% = 72%
АgNO3 + NH4SCN => AgSCN + NH4NO3
n(NH4SCN ) который ушел на титрование = 0.25 моль/л* 0.00405 л = 0.0010125 моль
n(АgNO3) который прореагировал = 0.0010125 моль
Далее посчитаем предыдущую стадию:
АgNO3 + KCl => AgCl + KNO3
n(KCL) = 0.2 моль/л * 0.025 л = 0.005 моль
n(KCL) = n(АgNO3) = 0.005 моль
n(АgNO3) общего = 0.005 моль + 0.0010125 моль = 0.0060125 моль
m(Ag) в сплаве = 0.0060125 моль * 108 г/моль = 0.64935 г
w(Ag) в сплаве = (0.64935 г/0.9010г)*100% = 72%
Форма ответа
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