What is an indicator?

A substance that can be added to the reaction mixture to indicate the equivalence point of the titration. Colored indicators are often used to measure pH. These indicators are a different color in a basic environment than in an acidic environment. Litmus, for example, is blue in a basic environment and red in an acidic environment.

Indicators are weak acids or weak bases (often derived from plant pigments) that have distinctly different colors in their ionized and non-ionized forms and which are related to the pH of the solution being tested.

For example, the use of a chemical named phenolphthalein as an indicator for a titration in which a strong base is used as the titrant and acid as the substance titrated would give a color change from colorless to pink in the reaction flask near the equivalence point.

Was this answer helpful?


4.5 (4)


Choose An Option That Best Describes Your Problem

Thank you. Your Feedback will Help us Serve you better.

Leave a Comment

Your Mobile number and Email id will not be published. Required fields are marked *




Free Class