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Консультация № 194669
10.02.2019, 20:07
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Помогите пожалуйста с решением задачки,очень прошу
для приготовления раствора HCL объемом 350 было взято 7мл исходного раствора плотностью 1.115. Рассчитайте нормальность полученного раствора и погрешность ее определения
Помогите пожалуйста с решением задачки,очень прошу
для приготовления раствора HCL объемом 350 было взято 7мл исходного раствора плотностью 1.115. Рассчитайте нормальность полученного раствора и погрешность ее определения
Обсуждение
10.02.2019, 22:54
общий
это ответ
Здравствуйте, Lettochka!
Согласно онлайн-калькулятору раствор HCl плотностью 1,115 г/мл имеет концентрацию 7,12 М
Тогда концентрация разбавленного раствора C2=7,12М[$183$]7мл/350мл=0,142 М
Для расчёта погрешности желательно иметь несколько более конкретные данные по погрешности измерений, в их отсутствие сделаем следующие предположения:
плотность дана с точностью 0,001, согласно онлайн-калькулятору она даёт относительную погрешность 0,9%
Предположим, что объём перенесён градуированной пипеткой с точностью 7,0[$177$]0,05 мл - относительная погрешность 0,7%
Пусть разбавление проведено в мерной колбе с точностью 350[$177$]1 мл - относительная погрешность 0,3%
Тогда складывая относительные погрешности квадратически, получаем r=[$8730$](0.9%2+0.7%2+0.3%2)=1.2%
Получаем концентрацию раствора
C2=0,142[$177$]0,002 М
Альтернативно, если использована пипетка с точностью 7,0[$177$]0,1 мл и мерный цилиндр с точностью 350[$177$]5 мл (погрешность обоих 1,4%), погрешность концентрации будет 2,2% и итоговое значение
C2=0,142[$177$]0,003 М
Согласно онлайн-калькулятору раствор HCl плотностью 1,115 г/мл имеет концентрацию 7,12 М
Тогда концентрация разбавленного раствора C2=7,12М[$183$]7мл/350мл=0,142 М
Для расчёта погрешности желательно иметь несколько более конкретные данные по погрешности измерений, в их отсутствие сделаем следующие предположения:
плотность дана с точностью 0,001, согласно онлайн-калькулятору она даёт относительную погрешность 0,9%
Предположим, что объём перенесён градуированной пипеткой с точностью 7,0[$177$]0,05 мл - относительная погрешность 0,7%
Пусть разбавление проведено в мерной колбе с точностью 350[$177$]1 мл - относительная погрешность 0,3%
Тогда складывая относительные погрешности квадратически, получаем r=[$8730$](0.9%2+0.7%2+0.3%2)=1.2%
Получаем концентрацию раствора
C2=0,142[$177$]0,002 М
Альтернативно, если использована пипетка с точностью 7,0[$177$]0,1 мл и мерный цилиндр с точностью 350[$177$]5 мл (погрешность обоих 1,4%), погрешность концентрации будет 2,2% и итоговое значение
C2=0,142[$177$]0,003 М
11.02.2019, 03:21
общий
Извините, спасибо большое за ответ, но можно ли как нибудь заменить онлайн калькулятор? т.к. я не могу так написать в контрольной, сразу возникнут вопросы
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