Electrochemical equivalent
From Wikipedia, the free encyclopedia
In Electrochemistry, the electrochemical equivalent (Eq or Z) of a chemical element is the mass of that element (in grams) transported by a specific quantity of electricity, usually expressed in grams per coulomb of electric charge.[1] The electrochemical equivalent of an element is measured with a voltameter.
The electrochemical equivalent of a substance is the mass of the substance deposited to one of the electrodes when a current of 1 ampere is passed for 1 second, i.e. a quantity of electricity of one coulomb is passed.[2]
This is an useful experimental quantity as it helps in many calculations in electrochemistry.[3]
The formula for finding electrochemical equivalent is as follows:
where is the mass of substance and is the charge passed. Since , where is the current applied and is time, we also have
Alternative formula for finding electrochemical equivalent is as follows:
where is the Equivalent weight of the substance and is Faraday constant.[4]
