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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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a
Ionized indicator is present in the larger amount
b
Unionized indicator is present in the larger amount
c
Both ionized and unionized indicator are present in equal amounts
d
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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