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Original text
Electrode potential, E, in electrochemistry, according to an IUPAC definition,[1] is the electromotive force of a cell built of two electrodes:
- on the left-hand side is the standard hydrogen electrode, and
- on the right-hand side is the electrode the potential of which is being defined.
By convention:
- ECell := ECathode − EAnode
From the above, for the cell with the standard hydrogen electrode (potential of 0 by convention), one obtains:
- ECell = ERight − 0 = EElectrode
The left-right convention is consistent with the international agreement that redox potentials be given for reactions written in the form of reduction half-reactions.
Electrode potential is measured in volts (V).
Revised text
Electrode potential, also known as Cell Potential, E, in electrochemistry, according to an IUPAC definition,[2] is the electromotive force of a cell built of two electrodes:
- on the left-hand side is the standard hydrogen electrode, and
- on the right-hand side is the electrode potential of which is being defined.
It is the maximum potential difference between the electrodes of a voltaic cell and can be measured with a voltmeter.
By convention:
- ECell := ECathode − EAnode
which can also be represented as:
- ECell := EReduction − EOxidation
since the reduction half-reaction occurs at the cathode and the oxidation half-reaction occurs at the anode.
From the above, for the cell with the standard hydrogen electrode (potential of 0 by convention), one obtains:
- ECell = ERight − 0 = EElectrode
The left-right convention is consistent with the international agreement that redox potentials be given for reactions written in the form of reduction half-reactions. A reduction potential is a measure of the tendency for a species to act as an oxidizing agent, which is the gain electrons
Electrode potential is measured in volts (V).
- ^ IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006- ) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook. Entry: "Electrode Potential"
- ^ IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006- ) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook. Entry: "Electrode Potential"