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The indicator constant of an indicator is 104. If pH of solution in which this indicator is present is 3.5, which of the following facts will be correct?

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Ionized indicator is present in the larger amount
Unionized indicator is present in the larger amount
Both ionized and unionized indicator are present in equal amounts
Percentage of indicator present in ionized form cannot be predicted

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detailed solution

Correct option is B

HInH++ + In; Since pH<pKHin, the solution contains larger H+ than that obtained from ionization of  HIn  alone. Hence, the above equilibrium is shift to left, thus more of unionized indicator is present.

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