Question

The electrochemical equivalent of a metal is x gram per coulomb equivalent weight of metal is

Answer 1

Electrochemical equivalent or ECE of an element is the mass of that element liberated or deposited at an electrode when one ampere of electricity is passed through an electrolytic cell for one second and is denoted by “Z”.

We know, Faraday’s first law of electrolysis states that “the mass of an element(W) liberated or deposited is proportional to the quantity of electric charge(Q) passed through the electrolyte during electrolysis”.

i.e. W∝Q

i.e.W∝It [Since q=it]

=>W=ZIt ,

[Here,Z is the proportionality constant,known as ECE]

=>Z=W/It , is the reqd. expression to calculate ECE of an element.