Verification of Faraday's Second Law of electrolysis | Physics4students
Faraday’s Second Law and its Verification are explained in this section.
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. Here Chemical equivalent is equal to Relative atomic mass by Valency
Verification of Faraday’s second law: Two electrolytic cells containing different electrolytes, Copper Sulphate solution and Silver Nitrate solution are connected in series with a battery, a rheostat and an ammeter. Copper electrodes are inserted in Copper Sulphate and silver electrodes are inserted in Silver Nitrate.
The cathodes are cleaned, dried, weighed and then inserted in the respective cells. The current is passed for some time. Then the cathodes are taken out, washed, dried and weighed. Hence the masses of copper and silver deposited are found as M1 and M2.
It is found that M1 by M2 is equal to E1 by E2 where E1 and E2 are the chemical equivalents of copper and silver respectively.
m proportional to E. Thus, the second law is verified.
