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 concentration of conjugate acid. (HNn) and the base [In^(-)) forms of the indicator by the expression

The rapid change of pH near the stoichiometric point of an acid-base t

1.	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 concentration of conjugate acid. (HNn) and the base [In^(-)) forms of the indicator by the expression
Answer» `LOG.([In^(-)])/([In^(-)])= pK_(In) -PH` `log.([HIN^(-)])/([In^(-)])= pK_(In) -pH` `log.([HIn^(-)])/([In^(-)])= pH_(In) -pK_(In)` `log.([In^(-)])/([ H In^(-)])= pH_(In) -pK_(In)` Solution :`pH = pK_(a)+log. (["Conjugate base"])/(["ACID"])` `:. pH - pK_(In)=log. ([In^(-)])/([HIn])`