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Консультация № 188611
07.01.2016, 17:47
0.00 руб.
07.01.2016, 22:47
0
2
1
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующие вопросы:
Какое из веществ: карбонат натрия, гидрокарбонат натрия или нитрат натрия будет взаимодействовать с уксусной кислотой? Выразите эти реакции молекулярными и ионно-молекулярными уравнениями.
Какую массовую долю фторида водорода должен иметь раствор, чтобы степень диссоциации раствора плавиковой кислоты составляла 1%?
Какое из веществ: карбонат натрия, гидрокарбонат натрия или нитрат натрия будет взаимодействовать с уксусной кислотой? Выразите эти реакции молекулярными и ионно-молекулярными уравнениями.
Какую массовую долю фторида водорода должен иметь раствор, чтобы степень диссоциации раствора плавиковой кислоты составляла 1%?
Обсуждение
07.01.2016, 17:48
общий
Не до конца допечатал. Полный вопрос тут:
Какое из веществ: карбонат натрия, гидрокарбонат натрия или нитрат натрия будет взаимодействовать с уксусной кислотой? Выразите эти реакции молекулярными и ионно-молекулярными уравнениями.
Какую массовую долю фторида водорода должен иметь раствор, чтобы степень диссоциации раствора плавиковой кислоты составляла 1%?
Какое из веществ: карбонат натрия, гидрокарбонат натрия или нитрат натрия будет взаимодействовать с уксусной кислотой? Выразите эти реакции молекулярными и ионно-молекулярными уравнениями.
Какую массовую долю фторида водорода должен иметь раствор, чтобы степень диссоциации раствора плавиковой кислоты составляла 1%?
08.01.2016, 12:40
общий
это ответ
Здравствуйте, eskimovisage1488!
NaHCO3+CH3COOH=CH3COONa+CO2+H2O
HCO3-+CH3COOH=CH3COO-+CO2+H2O
Na2CO3+2CH3COOH=2CH3COONa+CO2+H2O
CO32-+2CH3COOH=2CH3COO-+CO2+H2O
Ka=[H+][F-]/[HF]=6,31[$183$]10-4 M
Диссоциации на 1% соответствует следующее соотношение концентраций
[H+]=[F-]=0,01CHF
[HF]=0,99CHF
(0,01CHF)2/0,99CHF=6,31[$183$]10-4 M
1,01[$183$]10-4CHF=6,31[$183$]10-4 M
CHF=6,25 M
Принимая плотность раствора за близкую к плотности воды
[$969$]HF=6,25моль/л*20г/моль/1000г/л=0,125=12,5%
На самом деле ситуация с подобными концентрациями плавиковой кислоты осложняется её тенденцией образовывать димерные формы, особенно HF2-
NaHCO3+CH3COOH=CH3COONa+CO2+H2O
HCO3-+CH3COOH=CH3COO-+CO2+H2O
Na2CO3+2CH3COOH=2CH3COONa+CO2+H2O
CO32-+2CH3COOH=2CH3COO-+CO2+H2O
Ka=[H+][F-]/[HF]=6,31[$183$]10-4 M
Диссоциации на 1% соответствует следующее соотношение концентраций
[H+]=[F-]=0,01CHF
[HF]=0,99CHF
(0,01CHF)2/0,99CHF=6,31[$183$]10-4 M
1,01[$183$]10-4CHF=6,31[$183$]10-4 M
CHF=6,25 M
Принимая плотность раствора за близкую к плотности воды
[$969$]HF=6,25моль/л*20г/моль/1000г/л=0,125=12,5%
На самом деле ситуация с подобными концентрациями плавиковой кислоты осложняется её тенденцией образовывать димерные формы, особенно HF2-
Форма ответа
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