The rapid change of `pH` near the stoichiometric point of an acid-base titration is the basic of indicator detection. `pH` of the solution is related to the ratio of the concentration of conjugate acid `(Hin)` and base `(In^(-))` forms of the indicator by the expressionA. `log . ([ln^(-)])/([Hln])=pH-pK_(ln)`B. `log . ([ln^(-)])/([Hln])=pK_(ln)-pH`C. `log. ([Hln])/([ln^(-)])=pK_(ln)-pH`D. `log.([Hln])/([ln^(-)])=pH=pK_(ln)`

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

1.	The rapid change of `pH` near the stoichiometric point of an acid-base titration is the basic of indicator detection. `pH` of the solution is related to the ratio of the concentration of conjugate acid `(Hin)` and base `(In^(-))` forms of the indicator by the expressionA. `log . ([ln^(-)])/([Hln])=pH-pK_(ln)`B. `log . ([ln^(-)])/([Hln])=pK_(ln)-pH`C. `log. ([Hln])/([ln^(-)])=pK_(ln)-pH`D. `log.([Hln])/([ln^(-)])=pH=pK_(ln)`
Answer» Correct Answer - A `Hln hArr H^(+) +ln^(-)` `K_(ln)=([H^(+)][ln^(-)])/([Hln])` `-logK_(ln)=-log[H^(+)]-log.([ln^(-)])/([Hln])` `pK_(ln)=pK_(a)-log.([ln^(-)])/([Hln])` `log.([ln])/([Hln])=pH-pK_(ln)`

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