
43Review of Electrochemistry
2.3.1 Faraday’s First Law of Electrolysis
The amount of a substance consumed or produced due to chemical reac-
tion at one of the electrodes during electrolysis is directly proportional to
the amount of electricity transferred at that electrode. Amount of electricity
refers to electrical charge, typically measured in coulombs.
2.3.2 Faraday’s Second Law of Electrolysis
For a given amount of electric charge, the substance consumed or produced
at one of the electrodes is directly proportional to the equivalent mass.
Faraday’s laws can be written together as
QM
x
=
, (2.14)
where m
x
is the mass of a species x consu ...