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Консультация № 177574
31.03.2010, 11:07
38.92 руб.
0
1
1
Уважаемые эксперты!
Необходима ваша помощь в решении задач по аналитической химии.
Задача. Вычислить процентное содержание CaCO[sub]3[/sub] и MgCO[sub]3[/sub] в известняке, если при анализе из образца известняка массой 0,5569 г получили осадки: 0,2339 г CaO и 0,02117 г Mg[sub]2[/sub]P[sub]2[/sub]O[sub]7[/sub]
Заранее спасибо.
Необходима ваша помощь в решении задач по аналитической химии.
Задача. Вычислить процентное содержание CaCO[sub]3[/sub] и MgCO[sub]3[/sub] в известняке, если при анализе из образца известняка массой 0,5569 г получили осадки: 0,2339 г CaO и 0,02117 г Mg[sub]2[/sub]P[sub]2[/sub]O[sub]7[/sub]
Заранее спасибо.
Обсуждение
Неизвестный
31.03.2010, 12:24
общий
это ответ
Здравствуйте, Botsman.
Найдем массу карбоната кальция в пробе
Рассчитаем фактор пересчета - Гравиметрический фактор равен отношению молекулярных масс определяемого вещества (карбонат кальция) и весовой формы (оксид кальция) с учетом стехиометрических множителей
F= 100,09/56,08 =1,7847
По формуле g = a · F
где g - масса определяемого вещества,
a - масса весовой формы,
находим массу карбоната кальция в образце g=0,2339*1,7847=0,4175
массовая доля карбоната кальция w= 0,4175/0,5569=0,7496 или 74,96%
Найдем массу карбоната магния в пробе
Рассчитаем фактор пересчета F= 2*84,314/222,553=0,7577
находим массу карбоната магния в образце g= 0,02117*0,7577=0,01604
массовая доля карбоната магния w= 0,01604/0,5569=0,0288 или 2,88%
Найдем массу карбоната кальция в пробе
Рассчитаем фактор пересчета - Гравиметрический фактор равен отношению молекулярных масс определяемого вещества (карбонат кальция) и весовой формы (оксид кальция) с учетом стехиометрических множителей
F= 100,09/56,08 =1,7847
По формуле g = a · F
где g - масса определяемого вещества,
a - масса весовой формы,
находим массу карбоната кальция в образце g=0,2339*1,7847=0,4175
массовая доля карбоната кальция w= 0,4175/0,5569=0,7496 или 74,96%
Найдем массу карбоната магния в пробе
Рассчитаем фактор пересчета F= 2*84,314/222,553=0,7577
находим массу карбоната магния в образце g= 0,02117*0,7577=0,01604
массовая доля карбоната магния w= 0,01604/0,5569=0,0288 или 2,88%
5
Спасибо!
Форма ответа
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