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Задать вопрос экспертам

Консультация № 189745

06.09.2016, 14:55

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Образование

Уважаемые эксперты! Пожалуйста, ответьте на вопрос:

Составьте схему, напишите электронные уравнения электродных процессов и вычислите ЭДС гальванического элемента, состоящего из пластин кадмия и магния, опущенных в растворы своих солей с концентрацией [Mg2+] = [Cd2+] = 0,01 моль/л. Изменится ли значение ЭДС, если концентрацию каждого из ионов понизить до 0,0001 моль/л? Коэффициент активности ионов принять f=1.

Обсуждение

давно

Roman Chaplinsky / Химик CH

Модератор
156417
2175

11.09.2016, 09:13

общий

это ответ

Здравствуйте, line-di!
[$949$]⁰(Cd²⁺/Cd)=-0,403 В
[$949$]⁰(Mg²⁺/Mg)=-2,372 В

Mg|Mg²⁺||Cd²⁺|Cd
[$8496$]=[$949$](Cd²⁺/Cd)-[$949$](Mg²⁺/Mg)=[$949$]⁰(Cd²⁺/Cd)+RT/(2F)[$183$]ln[Cd²⁺]-[$949$]⁰(Mg²⁺/Mg)-RT/(2F)[$183$]ln[Mg²⁺]=[$949$]⁰(Cd²⁺/Cd)-[$949$]⁰(Mg²⁺/Mg)+RT/(2F)[$183$]ln([Cd²⁺]/[Mg²⁺])
При равных концентрациях ионов металлов (для электродов первого рода с равным зарядом ионов, что имеем в данной схеме) ЭДС равна стандартной и не меняется при изменении концентраций солей в равное число раз
[$8496$]=[$949$]⁰(Cd²⁺/Cd)-[$949$]⁰(Mg²⁺/Mg)+RT/(2F)[$183$]ln(1)=[$949$]⁰(Cd²⁺/Cd)-[$949$]⁰(Mg²⁺/Mg)=-0,403-(-2,372)=1,969 В

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