Question

explain faraday second law

Answer 1

Faraday's second law of electrolysis states that, when the same quantity of electricity is passed through several electrolytes, the mass of the substances deposited are proportional to their respective chemical equivalent or equivalent weight.

Answer 2

Hey there!


=>>> When the same quantity of electricity is passed through different electrolytes, the masses of the elements liberated or deposited are in proportion to the chemical equivalents of these elements. Faraday's laws are very useful for the determination of electrochemical equivalents of different substances.


Let us take an example of CuSO4 and AgNO3solutions connected in series, then if electricity passed is same then,

Weight of Cu deposited / Weight of Ag deposited = Eq. wt. of Cu/ eq. wt  of Ag

Here, charge carried by 1 mole of electrons = charge present in one electron x Avogadro's no. 

  = 1.6 x 10-19 Coulombs x 6.022 x 1023 

  = 9600 Coulombs ( Faraday's Constant)

Thus, according to second law, If n electrons are involved in the electrode reaction , then the passage of n faradays (i.e. n x 9600C) will liberate one mole of the substance.

Or, One Faraday of electricity will deposit 1 gm equivalent of the substance.

Hope it helped!☺️