Redox Indicator Definition

This is the chemical structure of 2,2'-bipyridine.
This is the chemical structure of 2,2'-bipyridine, a redox indicator. Brian Derksen/PD

Definition: A redox indicator is an indicator compound that changes color at specific potential differences.

A redox indicator compound must have a reduced and oxidized form with different colors and the redox process must be reversible.

Examples: The molecule 2,2'-Bipyridine is a redox indicator. In solution, it changes from light blue to red at an electrode potential of 0.97 V.

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Helmenstine, Anne Marie, Ph.D. "Redox Indicator Definition." ThoughtCo, Jun. 13, 2014, thoughtco.com/definition-of-redox-indicator-605602. Helmenstine, Anne Marie, Ph.D. (2014, June 13). Redox Indicator Definition. Retrieved from https://www.thoughtco.com/definition-of-redox-indicator-605602 Helmenstine, Anne Marie, Ph.D. "Redox Indicator Definition." ThoughtCo. https://www.thoughtco.com/definition-of-redox-indicator-605602 (accessed May 24, 2018).