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Консультация № 180147
04.10.2010, 00:40
0.00 руб.
0
1
1
3. Вычислить эквивалентную массу и эквивалент кремнивой кислоты H2SiO3, если в результате взаимодействия со щёлочью образуется:
1. Гидросиликат калия
2. Силикат калия
1. Гидросиликат калия
2. Силикат калия
Обсуждение
Неизвестный
04.10.2010, 02:59
общий
это ответ
Здравствуйте, Шинкаренко Сергей Владимирович.
Эквивалентом называется реальная или условная частица вещества, которая способна замещать, присоединять, высвобождать или просто быть равноценной одному иону водорода в кислотно-основных и ионно-обменных реакциях или одному электрону в окислительно-восстановительных реакциях.
Масса одного моля эквивалентов вещества называется молярной массой эквивалентов Мэ, г/моль.
При определении эквивалента вещества необходимо исходить из конкретной реакции, в которой участвует данное вещество. Для определения эквивалента кислоты существует формула МЭ кисл= Мкисл/число замещаемых в реакции ионов водорода
1. образование гидросиликата: КОН + H2SiO3= KHSiO3 + H2O
Происходит замещение 1 атома водорода, следовательно эквивалент кремниевой кислоты равен 1 молекуле, эквивалентная масса равна молярной массе т.е. 78 г/моль
2. образование силиката
Происходит замещение 2 атомов водорода, следовательно эквивалент кремниевой кислоты равен 1/2 молекуле, эквивалентная масса равна 1/2 молярной массы т.е. 78/2=39 г/моль
2КОН + H2SiO3 = K2 SiO3 + 2H2O
Эквивалентом называется реальная или условная частица вещества, которая способна замещать, присоединять, высвобождать или просто быть равноценной одному иону водорода в кислотно-основных и ионно-обменных реакциях или одному электрону в окислительно-восстановительных реакциях.
Масса одного моля эквивалентов вещества называется молярной массой эквивалентов Мэ, г/моль.
При определении эквивалента вещества необходимо исходить из конкретной реакции, в которой участвует данное вещество. Для определения эквивалента кислоты существует формула МЭ кисл= Мкисл/число замещаемых в реакции ионов водорода
1. образование гидросиликата: КОН + H2SiO3= KHSiO3 + H2O
Происходит замещение 1 атома водорода, следовательно эквивалент кремниевой кислоты равен 1 молекуле, эквивалентная масса равна молярной массе т.е. 78 г/моль
2. образование силиката
Происходит замещение 2 атомов водорода, следовательно эквивалент кремниевой кислоты равен 1/2 молекуле, эквивалентная масса равна 1/2 молярной массы т.е. 78/2=39 г/моль
2КОН + H2SiO3 = K2 SiO3 + 2H2O
5
огромное спасибо, за объяснение.....
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