Adsorption Indicator

Name:
Adsorption Indicator
Detailed information:
A substance used in analytical chemistry to detect the presence of a slight excess of another substance or ion in solution as the result of a color produced by adsorption of the indicator on a precipitate present in the solution. Thus, a precipitate of silver chloride will turn red in a solution containing even a minute excess of silver ion (silver nitrate solution) if fluorescein is present. In this example, fluorescein is the adsorption indicator.