Faraday Law
1st law:
The amount
of substance deposited or liberated on each electrolytic cell (electrode) is directly
proportional to the quantity of electricity passed through the electrolyte. If
Amount of
substance deposited = W
Amount of
electricity passed = Q
Then W
So, W
W = z IT e.q.12.1 also W
= zQ e.q.12.2
In both equations, z is
constant. If 1 ampere current passes in second, then he above equations will be
W = z e.q.12.3
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2nd Law:
If same amount
of electricity passes through different electrolytes, then the amount of
different substance deposited at the surface of electrode or liberated from the
surface are proportional to their chemical equivalent masses.
W = zQ e.q.12.2
For the
deposition of 1g equivalent weight of any substance, same amount of electricity
passes.
amount of electricity = W = equivalent
mass
the value of
equivalent mass is equal to 1 Ferrate which we also solved in the
thermodynamics topic. So,
W = zF e.q.12.4
e.q.12.4
gives us the value of constant z.
z = W/F e.q.12.5
W = Eq. mass = Molar mass / charge
(z)
Putting
value of W in e.q.12.5 we got,
z = Molar mass / zF
putting this
value of z in e.q.12.2 we got
 |
W = e.q.12.6
or W= 
Applications of Faraday law
- It is applied for coating of metals through electrode deposition. (cathode gets coated).
- It is used in photosynthesis which is an electrochemical process.
- It is applied in metallurgical process extraction of ores.
- It is utilized in measurement of glucose by redox process in diabetes.
- It is useful for recovery of Na metal from trace by electrolytic method.
- The hydrolysis of water for the production of electricity follows this law.
- It aids in the production of NaOH from aqueous solution of NaCl
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