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how an iron bucket which is placed in the bathroom containing some scratches behaves like an electrochemical cell?
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12th
Chemistry
Electrochemistry
Electrolytic Cells and Electrolysis
An electrochemical cell can...
CHEMISTRY
An electrochemical cell can behave like an electrolytic cell when:
November 22, 2019
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Aashutosh Chandar
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We can study the effect of opposing potential applied to a galvanic cell as follows.
1) When E
external
<1.1V
In a galvanic cell, if an external opposite potential is applied and increased slowly, we find that the reaction continues to take place till the opposing voltage reaches the value 1.1 V.
2) When E
external
=1.1V
When the external voltage is 1.1V the reaction stops altogether and no current flows through the cell.
3) When E
external
>1.1V
Any further increase in the external potential again starts the reaction but in the opposite direction. It now functions as an electrolytic cell, a device for using electrical energy to carry non-spontaneous chemical reactions.
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In oxidation–reduction (redox) reactions, electrons are transferred from one species (the reductant) to another (the oxidant). This transfer of electrons provides a means for converting chemical energy to electrical energy or vice versa. The study of the relationship between electricity and chemical reactions is called electrochemistry.