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A redox indicator (also called an oxidation-reduction indicator) is an indicator that undergoes a definite colour change at a specific electrode potential.
Additional recommended knowledge
The requirement for fast and reversible colour change means that the oxidation-reduction equilibrium for an indicator redox system needs to be established very fast. Therefore only a few classes of organic redox systems can be used for indicator purposes.
There are two common type of redox indicators:
Sometimes coloured inorganic oxidants or reductants (Ex. Potassium manganate, Potassium dichromate) are also incorrectly called redox indicators. They can’t be classified as true redox indicators because of their irreversibility.
Almost all redox indicators with true organic redox systems involve a proton as a participant in their electrochemical reaction. Therefore sometimes redox indicators are also divided into two general groups: independent or dependent on pH.
pH independent redox indicators
pH dependent redox indicators
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Redox_indicator". A list of authors is available in Wikipedia.|