Faraday’s First Law of
Electrolysis
The mass of a substance deposited or liberated at any
electrode is directly proportional to quantity of
electric current passed.
If W grams of a substance is deposited or liberated on passing Q Coulomb of charge then :
W 
Q
and W = Z x Q
where Z is the proportionality constant and is called the Electrochemical Equivalent
Faraday’s Second Law of
Electrolysis
When the same amount of charge is made to pass through
any number of electrolytes, the mass of the substance
liberated or deposited at the electrodes are directly
proportional to their chemical equivalents.
Chemical equivalent = atomic mass / valence
m1/m2 = E1/E2
where m1 and m2 are
the respective masses liberated or deposited on the
electrodes
and E1 and E2 are the chemical
equivalents of the substances liberated or deposited.