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Консультация № 189156
11.04.2016, 13:04
0.00 руб.
12.04.2016, 18:27
0
1
1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
При какой концентрации ионов меди Cu2+ в моль/л значение потенциала медного электрода становится равным стандартному потенциалу водородного элемента?
спасибо)
При какой концентрации ионов меди Cu2+ в моль/л значение потенциала медного электрода становится равным стандартному потенциалу водородного элемента?
спасибо)
Обсуждение
11.04.2016, 16:26
общий
это ответ
Здравствуйте, Katerina!
[$949$]0(Cu2+/Cu)=0,342 В
[$949$](Cu2+/Cu)=[$949$]0(Cu2+/Cu)-RT/ZF[$183$]lnQ=[$949$]0(Cu2+/Cu)+RT/2F[$183$]ln[Cu2+]=[$949$]0(H+/H2)=0
[$949$]0(Cu2+/Cu)=RT/2F[$183$]ln[Cu2+]
ln[Cu2+]=-2F([$949$]0(Cu2+/Cu)-[$949$]0(H+/H2))/RT=-2[$183$]96500Кл/моль[$183$]0,342В/(8,314Дж/(моль[$183$]К)[$183$]298К)=-26,6
[Cu2+]=2,7[$183$]10-12 М
Возможны ли такие концентрации на практике? В формулу входит концентрация свободных ионов меди. То есть, если связать медь в комплексное соединение так, чтобы равновесная концентрация свободных ионов была 2,7[$183$]10-12 М, потенциал медного электрода действительно окажется равным потенциалу стандартного водородного электрода, при этом электродный процесс моет протекать с достаточно значительной скоростью при достаточной концентрации комплекса.
[$949$]0(Cu2+/Cu)=0,342 В
[$949$](Cu2+/Cu)=[$949$]0(Cu2+/Cu)-RT/ZF[$183$]lnQ=[$949$]0(Cu2+/Cu)+RT/2F[$183$]ln[Cu2+]=[$949$]0(H+/H2)=0
[$949$]0(Cu2+/Cu)=RT/2F[$183$]ln[Cu2+]
ln[Cu2+]=-2F([$949$]0(Cu2+/Cu)-[$949$]0(H+/H2))/RT=-2[$183$]96500Кл/моль[$183$]0,342В/(8,314Дж/(моль[$183$]К)[$183$]298К)=-26,6
[Cu2+]=2,7[$183$]10-12 М
Возможны ли такие концентрации на практике? В формулу входит концентрация свободных ионов меди. То есть, если связать медь в комплексное соединение так, чтобы равновесная концентрация свободных ионов была 2,7[$183$]10-12 М, потенциал медного электрода действительно окажется равным потенциалу стандартного водородного электрода, при этом электродный процесс моет протекать с достаточно значительной скоростью при достаточной концентрации комплекса.
5
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