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Задать вопрос экспертам

Консультация № 177569

31.03.2010, 10:41

40.27 руб.

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Образование

Уважаемые эксперты!
Необходима ваша помощь в решении задач по аналитической химии.
Задача. На титрование 25,00 мл раствора серной кислоты расходуется 28,65 мл 0,1174 М[sub]экв[/sub] NaOH. Сколько грамм H[sub]2[/sub]SO[sub]4[/sub] содержится в 500,0 мл анализируемого раствора?
Заранее спасибо.

Обсуждение

Неизвестный

31.03.2010, 11:09

общий

это ответ

Здравствуйте, Botsman.
По результатам прямого титрования рассчитаем молярную концентрацию эквивалента раствора серной кислоты
C= C(NaOH)*V(NaOH)/V(к-ты) C=0,1174*28,65/25,00 =0,1345
Масса серной кислоты в 500 мл раствора (0,5 л)
M= c* Мэ* V=0,1345*49*0,5=3,29
Мэ – молярная масса серной кислоты равная ½ молярной массы, т.к. кислота двухосновная

5

Спасибо!

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