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Wednesday, 26 December 2012

Faraday’s law of electrolysis


Faraday’s law of electrolysis

The factor s affecting the quantities of matter liberated during the process of electrolysis were  investigated by faraday.
First Law: The mass of a substance liberated at an electrode is directly proportional to the charge passing through the electrolyte.
            If an electric current I is passed through the electrolyte for a time t, the amount of charge (q) passed is It. According to the law, mass of substance liberated (m) is
                                    M α q   or m=zit
Where Z is constant for the substance being liberated called as electrochemical equivalent. Its unit is kg C-1.
            The electrochemical equivalent of a substance is defined as the mass of substance liberated in electrolysis when one coulomb charge is passed through the electrolyte.

Second Law: The mass of a substance liberated at an electrode by a given amount of charge is proportional to the chemical equivalent of the substance.
            If E is the chemical equivalent of a substance, from the second law
                                                            mαE 

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