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Faraday's First Law Of Electrolysis
Michael Faraday in 1833, discovered the quantitative laws governing the process of electrolysis , which are known as faraday's laws of electrolysis. There are two laws of electrolysis given faraday,
But here we will discuss the first law which is known as:
Faraday's First Law Of Electrolysis
It can be defined as Amount of substance deposited or liberated is directly proportional to the quantity of current passed the solution.
Or
The amount of any substance deposited or liberated at an electrode during electrolysis is directly proportional to the quantity of current passed through the electrolyte.
Or
The mass of an element which is deposited on an electrode during electrolysis is directly proportional to the quantity of electricity which passes through the electrolyte.
Explanation: If 'W' be the weight or amount of a substance deposited or liberated, and 'A' ampere of current is passed for 't' seconds, then according to the law:
W = Z A T
Where Z is a constant, known as " electro chemical equivalent" of the substance. If one ampere of current is passed for one second; then w=Z . This means when one ampere of current is passed for one second; then the weight or amount of the substance deposited or liberated is exactly equal to its electrochemical equivalent. The current in ampere, multiplied by the time in second is known as columb which is the electric charge.
Ampere{A} × time{s} = columb {C}
Examples: A current of 3 ampere was passed through a solution of CuSO⁴ for one hour. Calculate the mass of copper metal deposited on the cathode. Electrochemical equivalent of Cu=0.000329g/C or 3.294×10^-7 Kg/C.
Solution:
Data:
1. Current in ampere (A) =3
2.Time in second (1 hour)= 1 ×60×60=3600s
3.Z for Cu metal = 0.000329g/C=3.294×10^-7 Kg/C.
Formula
W = Z×A×T
=3.294×10^-7 × 3× 3600
=3.55752×10^-3 Kg
Mass of copper metal deposited= 3.55752×10^-3 Kg.
Michael Faraday in 1833, discovered the quantitative laws governing the process of electrolysis , which are known as faraday's laws of electrolysis. There are two laws of electrolysis given faraday,
But here we will discuss the first law which is known as:
Faraday's First Law Of Electrolysis
It can be defined as Amount of substance deposited or liberated is directly proportional to the quantity of current passed the solution.
Or
The amount of any substance deposited or liberated at an electrode during electrolysis is directly proportional to the quantity of current passed through the electrolyte.
Or
The mass of an element which is deposited on an electrode during electrolysis is directly proportional to the quantity of electricity which passes through the electrolyte.
Explanation: If 'W' be the weight or amount of a substance deposited or liberated, and 'A' ampere of current is passed for 't' seconds, then according to the law:
W = Z A T
Where Z is a constant, known as " electro chemical equivalent" of the substance. If one ampere of current is passed for one second; then w=Z . This means when one ampere of current is passed for one second; then the weight or amount of the substance deposited or liberated is exactly equal to its electrochemical equivalent. The current in ampere, multiplied by the time in second is known as columb which is the electric charge.
Ampere{A} × time{s} = columb {C}
Examples: A current of 3 ampere was passed through a solution of CuSO⁴ for one hour. Calculate the mass of copper metal deposited on the cathode. Electrochemical equivalent of Cu=0.000329g/C or 3.294×10^-7 Kg/C.
Solution:
Data:
1. Current in ampere (A) =3
2.Time in second (1 hour)= 1 ×60×60=3600s
3.Z for Cu metal = 0.000329g/C=3.294×10^-7 Kg/C.
Formula
W = Z×A×T
=3.294×10^-7 × 3× 3600
=3.55752×10^-3 Kg
Mass of copper metal deposited= 3.55752×10^-3 Kg.
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