redox indicator

https://doi.org/10.1351/goldbook.09049
Visual indicator that reacts with excess titrant or titrand with a color change at the end-point of a redox titration.
Example:
Titration of iodine by thiosulfate (SOA3SA2−) uses a starch solution to produce a strong blue color. At the end-point, when all diiodine is reacted, the solution becomes colorless.
Source:
PAC, 2025, 97, 137. (Glossary of terms for mass and volume in analytical chemistry (IUPAC Recommendations 2024)) on page 5 [Terms] [Paper]
Citation: 'redox indicator' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.09049 RIS BibTex EndNote
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