Adsorption indicator

{
  "id": "MLC-T-CHM-000289",
  "term": "Adsorption indicator",
  "field": "Chemistry",
  "definition": "A substance used in precipitation titrations that changes color when adsorbed onto the surface of the precipitate at the equivalence point. The color change is typically due to a change in the indicator's electronic structure upon adsorption, which is influenced by the charge on the precipitate surface. Fluorescein is a common example used in argentometric titrations.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "titration"
  ],
  "references": [
    "Orange Book, 2nd ed., p. 48 (https://media.iupac.org/publications/analytical_compendium/)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/adsorption-indicator/"
}