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The rapid change of pH near the stoichiometric point of an acid-base titration is the basis of indicator detection. pH of the solution is related to ratio of the concentrations of the conjugate acid (HIn) and base (In-) forms of the indicator by the expression

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The correct option is : 

Explanation:

Let us consider the formation of a salt of a weak acid and a strong base.

Other equations present in the solution are

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