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Уважаемые эксперты! Необходима ваша помощь в решении задач по аналитической химии. Задача. Какой объем 40%-ного раствора (пл. 1,246) азотной кислоты необходим для приготовления 200 мл 5%-ного раствора кислоты (пл. 1,027). Рассчитайте молярность, нормальность, титр и титр по NaOH полученного раствора. Заранее спасибо.
Обсуждение
Неизвестный
31.03.2010, 12:45
общий
это ответ
Здравствуйте, Botsman. При разбавлении растворов можно воспользоваться формулой w1 Ч r1 Ч V1 = w2 Ч r2 Ч V2 5*1,027*200=40*1,246 *V V=20,6 мл Молярная концентрация данного раствора равна С=m*V/M Молярная масса азотной кислоты равна 63 г/моль, раствор 5%-ный - значит в 0,1 л содержится 5 г азотной кислоты, масса раствора равна произведению объема и плотности С= 5*0,1*1,027/63= 0,00815 моль/л Так как молярная масса эквивалента азотной кислоты равна молярной массе, то нормальность (молярная масса эквивалента) равна молярной концентрации Титр - масса вещества в 1 мл раствора Т=5/100=0,05 г/мл Титр по определяемому веществу обозначает массу определяемого вещества (в данном случае гидроксида натрия) эквивалентную 1 мл данного раствора ТNaOH=С* МЭ/1000 =0,00815*40/1000=0,000326 г Mэ – молярная масса эквивалента гидроксида натрия
5
Спасибо!
Неизвестный
31.03.2010, 13:09
общий
Himoza: Спасибо за решение. Только не совсем понял, что означают буквы в выражении
w1 Ч r1 Ч V1 = w2 Ч r2 Ч V2
r - это [$961$](плотность)?А что такое Ч - не понял совсем. Помогите, пожалуйста...
Неизвестный
31.03.2010, 13:13
общий
Botsman: Это знак умножения. простите за некоторую компьютерную неграмотность - при копировании вечно косяки...
Неизвестный
31.03.2010, 13:39
общий
Himoza: Спасибо. В данной рассылке химическая грамотность гораздо важнее компьютерной неграмотности :))), а наличие мини-форума уменьшает значение последней еще больше. Кстати, вы упомянули копирование. В связи с чем (вдруг пригодится в будущем)могу посоветовать в ответе давать еще и ссылку на оригинальный файл, в котором вы изначально писали ответ на вопрос, а сам файл размещать в "личных файлах" по той же схеме, что и размещение рисунка, о котором я вам рассказывал.
Неизвестный
31.03.2010, 14:41
общий
Хорошо, я все поняла. Просто я формулы копирую из электронной версии своего учебного пособия.
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