It tells when the equivalence point is obtained, this is the purpose of an indicator in the solution with the unknown concentration.
An indicator is a substance that changes color in response to a chemical change. An acid-base indicator. It detects hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model.
Option A - is not the main function of an indicator.
Option C - is also not the main function of an indicator.
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