Answer:
An indicator is a substance that changes color in response to a change in pH or the presence or absence of a certain substance. In a titration, the indicator is used to signal the endpoint of the reaction, which is when all the analyte has reacted with the titrant. At this point, the indicator changes color, indicating that the reaction is complete. This helps the titration operator to accurately determine the amount of analyte present in the sample.
Step-by-step explanation: