Answer:
A chemical indicator is a substance that changes color in the presence of a chemical reaction. Indicators are used in titrations to determine the point at which the reactants have been used up and the products have been formed. In acid-base titrations, indicators are used to determine the point at which the solution changes from acidic to basic. In redox titrations, indicators are used to determine the point at which the solution changes from reductive to oxidative.
Explanation:
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