Term: adsorption indicator
https://doi.org/10.1351/goldbook.A00162

Definition:
A substance which is adsorbed or desorbed with concomitant colour change at or near the equivalence point of a titration.

Related Terms:
1) equivalence point (http://doi.org/10.1351/goldbook.T06387-1).
2) titration (http://doi.org/10.1351/goldbook.T06387-2).

Source: Orange Book, 2nd ed., p. 48 (https://media.iupac.org/publications/analytical_compendium/)

Citation: 'adsorption 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.A00162

License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms.

Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.