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NEET 2004 Chemistry question

ChemistryEquilibriumNEET 2004

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 () forms of the indicator by the expression :-

Answer: (1),(3)

Solution

For the indicator equilibrium , . Taking logarithms with a negative sign gives the Henderson-type relation , i.e.

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Question ID VK-089429