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Консультация № 181936
19.01.2011, 02:48
53.35 руб.
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Сколько процентов железа содержится в железной проволоке, если после растворения 0,14г в серной кислоте без доступа воздуха на титрование полученного раствора FeSO4 израсходовано 24,85мл 0,1-нормального раствора перманганата калия? Титрование проводили в среде серной кислоты.
Сколько процентов железа содержится в железной проволоке, если после растворения 0,14г в серной кислоте без доступа воздуха на титрование полученного раствора FeSO4 израсходовано 24,85мл 0,1-нормального раствора перманганата калия? Титрование проводили в среде серной кислоты.
Обсуждение
Неизвестный
19.01.2011, 10:50
общий
это ответ
Здравствуйте, roover!
Количественное определение железа основано на реакции с перманганатом калия в среде серной кислоты.
окислительно-восстановительная реакция состоит из двух полуреакций:
MnO4¯ + 8H+ + 5ē = Mn2++ 4H2O
Fe2+- ē = Fe3+
10 FeSO4+ 4КMnO4 + 8H2SO4 = 5 Fe2(SO4)3+ 4MnSO4 + 2K2SO4 + 8H2O
Ион железа отдает один электрон, следовательно, фактор эквивалентности равен 1, а молярная масса эквивалента равна молярной массе 55,85 г/моль
Воспользуемся формулой расчета массы анализируемого вещества в методе отдельных навесок
mFe= VT* CN* Mэ/1000
VT - объем титранта (перманганата калия)
CN – молярная концентрация эквивалента титранта
Mэ – молярная масса эквивалента определяемого вещества (железа )
подставим данные титрования m = 24,85 *0,1* 55,85 /1000=0,1387
Затем рассчитаем массовую долю железа в проволоке, как отношение массы железа к массе проволоки, выраженное в процентах
W =0,1387/0,14 *100= 99,13%
Количественное определение железа основано на реакции с перманганатом калия в среде серной кислоты.
окислительно-восстановительная реакция состоит из двух полуреакций:
MnO4¯ + 8H+ + 5ē = Mn2++ 4H2O
Fe2+- ē = Fe3+
10 FeSO4+ 4КMnO4 + 8H2SO4 = 5 Fe2(SO4)3+ 4MnSO4 + 2K2SO4 + 8H2O
Ион железа отдает один электрон, следовательно, фактор эквивалентности равен 1, а молярная масса эквивалента равна молярной массе 55,85 г/моль
Воспользуемся формулой расчета массы анализируемого вещества в методе отдельных навесок
mFe= VT* CN* Mэ/1000
VT - объем титранта (перманганата калия)
CN – молярная концентрация эквивалента титранта
Mэ – молярная масса эквивалента определяемого вещества (железа )
подставим данные титрования m = 24,85 *0,1* 55,85 /1000=0,1387
Затем рассчитаем массовую долю железа в проволоке, как отношение массы железа к массе проволоки, выраженное в процентах
W =0,1387/0,14 *100= 99,13%
5
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