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Консультация № 188927
12.03.2016, 14:57
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Сравнить химическую активность 2н раствора соляной и 2н раствора уксусной кислот по их реакции с цинком. Объяснить различия в скорости протекания реакций. Написать ионные , молекулярные уравнения этих реакция.
Сравнить химическую активность 2н раствора соляной и 2н раствора уксусной кислот по их реакции с цинком. Объяснить различия в скорости протекания реакций. Написать ионные , молекулярные уравнения этих реакция.
Обсуждение
13.03.2016, 18:35
общий
это ответ
Здравствуйте, samstep.stepanov!
С соляной кислотой реакция протекает очень активно - с цинком реагируют находящиеся в растворе ионы водорода:
Zn+2HCl=ZnCl2+H2[$8593$]
Zn+2H+=Zn2++H2[$8593$]
Реакция с уксусной кислотой более медленная. При этом реакция возможна не только с диссоциированными ионами водорода (концентрация которых гораздо меньше, чем у соляной кислоты), но и непосредственно с молекулярной формой кислоты (но скорость реакции при этом также значительно меньше из-за различий в энтальпии и энергии активации, а также геометрических эффектов).
В любом случае суммарное уравнение этой реакции имеет вид
Zn+2CH3COOH=Zn(CH3COO)2+H2[$8593$]
Zn+2CH3COOH=Zn2++2CH3COO-+H2[$8593$]
С соляной кислотой реакция протекает очень активно - с цинком реагируют находящиеся в растворе ионы водорода:
Zn+2HCl=ZnCl2+H2[$8593$]
Zn+2H+=Zn2++H2[$8593$]
Реакция с уксусной кислотой более медленная. При этом реакция возможна не только с диссоциированными ионами водорода (концентрация которых гораздо меньше, чем у соляной кислоты), но и непосредственно с молекулярной формой кислоты (но скорость реакции при этом также значительно меньше из-за различий в энтальпии и энергии активации, а также геометрических эффектов).
В любом случае суммарное уравнение этой реакции имеет вид
Zn+2CH3COOH=Zn(CH3COO)2+H2[$8593$]
Zn+2CH3COOH=Zn2++2CH3COO-+H2[$8593$]
5
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