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Уважаемые эксперты! Пожалуйста, ответьте на вопрос: Помогите решить задачу по физике...
нужно найти концентрацию сахара в растворе.
Условие: Угол поворота плоскости поляризации желтого цвета натрия при прохождении через трубку с раствором сахара [$966$] = 40°. Длина трубки l = 15 см. Удельное вращение сахара [$966$]0 = 6,65 [$176$][$183$]см2/г. Определить концентрацию сахара в растворе. Можете объяснить, как решается задача? Спасибо.
Найти плотность раствора? Либо это задача очень сильно на засыпку (и тогда ещё понадобится изучить таблицы зависимости плотности раствора от концентрации), либо автор сам не совсем понял, что там должно получиться. И учитывая путаницу с показателем степени (1.17[$183$]10[sup]-2[/sup] рад[$183$]м[sup]3[/sup]/(м[$183$]кг) - это примерно правильное значение, но тут ещё вопрос, зачем его привели к этой размерности, особенно если угол дали в градусах), я больше склоняюсь ко второму варианту. Дело в том, что если вращение разделить на длину и удельное вращение, то ответ будет иметь размерность отношения массы к объёму, но это не будет плотность! Это будет массовая концентрация вещества в растворе.
Из имеющихся данных получается примерно 400 кг/м3, но это 400 кг сахарозы в 1 м3 раствора, а вовсе не 400 кг раствора в 1 м3
Добрый вечер. Вы правы, нужно найти концентрацию сахара в растворе.
Условие: Угол поворота плоскости поляризации желтого цвета натрия при прохождении через трубку с раствором сахара φ = 40°. Длина трубки 1 = 15 см. Удельное вращение сахара φ0 = 6,65 град см2/г. Определить концентрацию сахара в растворе. Можете объяснить, как решается задача? Спасибо.
Здравствуйте, User194586! Взаимосвязь указанных величин достаточно проста: Угол поворота плоскости поляризованного света прямо пропорционален концентрации (массовой или молярной, но обязательно выраженной на единицу объёма) оптически активного вещества и длине, пройденной лучом в растворе, а коэффициент пропорциональности называется удельным вращением. В данном случае удельное вращение выражено для массовой концентрации, то есть выражение угла поворота [$966$]=[$966$]0cml выражаем массовую концентрацию сm=[$966$]/([$966$]0l)=40[$176$]/(6,65[$176$][$183$]см[sup]2[/sup]/г[$183$]15см)=0,401 г/см3=401 г/л=401 кг/м3 Точнее, это значение следует округлить до 0,40 г/см3=4,0[$183$]102кг/м3 Можно также выразить из этого значения молярную концентрацию сахарозы C=401г/л/342г/моль=1,17 моль/л
5
Спасибо большое!
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