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Задать вопрос экспертам

Консультация № 189123

08.04.2016, 08:59

0.00 руб.

08.04.2016, 17:25

0 1 1

Образование

Здравствуйте! У меня возникли сложности с таким вопросом:

Электролиз раствора K₂SO₄ проводили при силе тока 5А в течение 3 ч. Составить электронные уравнения процессов, происходящих на электродах, вычислить объем выделяющихся на электродах веществ.

спасибо

Обсуждение

давно

Roman Chaplinsky / Химик CH

Модератор
156417
2175

08.04.2016, 17:24

общий

это ответ

Здравствуйте, Katerina!
Ни один из этих ионов не электролизуется в водном растворе, поскольку потенциалы возможных реакций лежат вне интервала электрохимической стабильности воды. То есть произойдёт электролиз воды.
A(+) 2H₂O-4e^-=O₂[$8593$]+4H⁺
K(-) 2H₂O+2e^-=H₂[$8593$]+2OH^-

количество электронов
n(e^-)=It/F=5А[$183$]3ч[$183$]3600с/ч/96500Кл/моль=0,56 моль
количества газов
n(O₂)=n(e^-)/4=0,14 моль
n(H₂)=n(e^-)/2=0,28 моль
Их объёмы (при н. у.)
V(O₂)=3,13 л
V(H₂)=6,27 л

5

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