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Questions
State Faraday’s first law of electrolysis.
State the following:
Faraday’s first law of electrolysis.
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Solution 1
Faraday’s first law of electrolysis states that “the amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolytic solution or melt”.
Solution 2
Faraday’s first law of electrolysis may be stated as follows.
The amount of substance liberated (or deposited) at a particular electrode during electrolysis is directly proportional to the quantity of electricity (total charge) passed in the solution.
W ∝ Q
Since Charge = Current × Time
we have Q = I × t
where I is the current (in amperes) passed in the solution for t seconds. Hence,
W ∝ I × t
or, W = Z × I × t ...(i)
In the above equation, Z is a constant known as the electrochemical equivalent of the substance liberated at the electrode.
If I = 1 ampere and t = 1 s, we have
W = Z
Hence, electrochemical equivalent may be defined as the amount of substance liberated by a current of one ampere passed for one second.
