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Консультация № 177572
31.03.2010, 11:01
39.47 руб.
0
1
1
Уважаемые эксперты!
Необходима ваша помощь в решении задач по аналитической химии.
Задача. В мерной колбе на 500,0 мл растворили 5,3000 г технического хлорида калия. К 25,0 мл раствора прибавили 50 мл 0,1 М[sub]экв[/sub] раствора нитрата серебра. На титрование избытка нитрата серебра расходуется 23,8 мл раствора тиоционата аммония с титром по серебру T[sub]NH4SCN/Ag[/sub]=0.010680 г/мл. Вычислить процентное содержание хлорида калия в образце.
Заранее спасибо.
Необходима ваша помощь в решении задач по аналитической химии.
Задача. В мерной колбе на 500,0 мл растворили 5,3000 г технического хлорида калия. К 25,0 мл раствора прибавили 50 мл 0,1 М[sub]экв[/sub] раствора нитрата серебра. На титрование избытка нитрата серебра расходуется 23,8 мл раствора тиоционата аммония с титром по серебру T[sub]NH4SCN/Ag[/sub]=0.010680 г/мл. Вычислить процентное содержание хлорида калия в образце.
Заранее спасибо.
Обсуждение
Неизвестный
31.03.2010, 11:57
общий
это ответ
Здравствуйте, Botsman.
Расчет по результатам обратного титрования проводится по уравнению
g= Mэ(C*V – C1V1)/1000
где g – масса искомого вещества в навеске
Мэ – молярная масса эквивалента искомого вещества хлорида калия 74,55 г/моль
V – объем рабочего раствора, взятого в избытке - нитрата серебра
С – молярная концентрация эквивалента этого раствора
V1 – объем другого рабочего раствора, израсходованного на титрование избытка тиоционата аммония
С1– молярная концентрация эквивалента этого раствора
Исходя из значения титра по серебру рассчитаем молярную концентрацию раствора тиоционата аммония
С1=Т*1000/Мэ = 0,010680*1000/108=0,1 моль/л
g= 74,55 (0,1*50 –0,1*23,8)/1000 =0,1953 г
эта масса хлорида калия в 25 мл, в 500 мл – 3,9064 г
массовая доля хлорида калия в навеске w = 3,9064/5,300=0,7370 или 73,70%
Расчет по результатам обратного титрования проводится по уравнению
g= Mэ(C*V – C1V1)/1000
где g – масса искомого вещества в навеске
Мэ – молярная масса эквивалента искомого вещества хлорида калия 74,55 г/моль
V – объем рабочего раствора, взятого в избытке - нитрата серебра
С – молярная концентрация эквивалента этого раствора
V1 – объем другого рабочего раствора, израсходованного на титрование избытка тиоционата аммония
С1– молярная концентрация эквивалента этого раствора
Исходя из значения титра по серебру рассчитаем молярную концентрацию раствора тиоционата аммония
С1=Т*1000/Мэ = 0,010680*1000/108=0,1 моль/л
g= 74,55 (0,1*50 –0,1*23,8)/1000 =0,1953 г
эта масса хлорида калия в 25 мл, в 500 мл – 3,9064 г
массовая доля хлорида калия в навеске w = 3,9064/5,300=0,7370 или 73,70%
5
Спасибо!
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