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Faraday's put forward his two laws of electrolysis in 1833.
Statement:
The mass of an elements which is deposited on an electrode during electrolysis is directly proportional to the quantity of electricity which passes through the electrolyte.
Explanation:
If W is the amount of substance which liberates or deposited at the electrode on passing the electricity through the electrolyte and the quantity of electricity is Q, then
or W = ZQ
Z is the electrochemical constant for a given substance.
As
We can write the statement of the first law of electrolysis mathematically as under:
or W= Zat
If 1 ampere electric current passes through the electrolyte for 1 second then W=Z It means that on passing the current of 1 ampere for 1 second the weight of the substance deposited is equal to the electrochemical constant. For doing the calculations of electrochemical problems, we must know the units too.
unit of charge (Q) = Coulomb (C)
unit of mass (m) = Kilogram (kg)
unit of current (A) = ampere (A)
unit of electrochemical equivalent (Z) = kg/C
Note:
Faraday's first law of electrolysis is written as:
W = ZAt
Here;
W= is actually mass and not weight, as mas is commonly called weight.
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Friday, April 30, 2010
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