Faraday′s Laws of Electrolysis

Fundamental laws of electrochemistry discovered by Faraday.

Faraday′s First Law of Electrolysis

The amount of chemical change during electrolysis is proportional to the charge passed.

Faraday′s Second Law of Electrolysis

The charge Q required to deposit or liberate a mass m is proportional to the charge z of the ion, the mass, and inversely proportional to the relative ionic mass M.


m = mass of the substance liberated at an electrode [g]
Q = total electric charge passed through the substance [C]
F = Faraday constant = 96,485 [C mol-1]
M = molar mass of the substance [mol]
z = valency number of ions of the substance

See also: Faraday Constant, Faraday, Michael.

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Subjects: Electrochemistry