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Консультация № 177570
31.03.2010, 10:48
40.01 руб.
0
1
1
Уважаемые эксперты!
Необходима ваша помощь в решении задач по аналитической химии.
Задача. Навеску 0,1376 г Na[sub]2[/sub]CO[sub]3[/sub] растворили в воде, добавили 25,0 мл 0,2143 М[sub]экв[/sub] раствора раствора HCl, избыток кислоты оттитровали 23,5 мл 0,1198 М[sub]экв[/sub] раствора NaOH. Рассчитать массовую долю примесей в соде.
Заранее спасибо.
Необходима ваша помощь в решении задач по аналитической химии.
Задача. Навеску 0,1376 г Na[sub]2[/sub]CO[sub]3[/sub] растворили в воде, добавили 25,0 мл 0,2143 М[sub]экв[/sub] раствора раствора HCl, избыток кислоты оттитровали 23,5 мл 0,1198 М[sub]экв[/sub] раствора NaOH. Рассчитать массовую долю примесей в соде.
Заранее спасибо.
Обсуждение
Неизвестный
31.03.2010, 11:23
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 карбоната натрия 53 г/моль
V – объем рабочего раствора, взятого в избытке - соляной кислоты
С – молярная концентрация эквивалента этого раствора
V1 – объем другого рабочего раствора, израсходованного на титрование избытка - гидроксида натрия
С1– молярная концентрация эквивалента этого раствора
g= 53*(0,2143*25,00 – 0,1198*23,5)=0,1347 г
масса примесей в навеске 0,1376-0,1347=0,0029
массовая доля примесей w=0,0029/0,1376=0,021 или 2,1%
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 карбоната натрия 53 г/моль
V – объем рабочего раствора, взятого в избытке - соляной кислоты
С – молярная концентрация эквивалента этого раствора
V1 – объем другого рабочего раствора, израсходованного на титрование избытка - гидроксида натрия
С1– молярная концентрация эквивалента этого раствора
g= 53*(0,2143*25,00 – 0,1198*23,5)=0,1347 г
масса примесей в навеске 0,1376-0,1347=0,0029
массовая доля примесей w=0,0029/0,1376=0,021 или 2,1%
5
Спасибо!
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