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An acid base indicator has K(HIn)=3.0xx1...

An acid base indicator has `K_(HIn)=3.0xx10^(-5)`. The acid from of the indicator is red and the basic form is blue the change in `(H^(+))` required to change the indicator from 75% red to 75%blue is :-

A

`8xx10^(-5)M`

B

`9xx10^(-5)M`

C

`10^(-5)M`

D

`3xx10^(-4)M`

Text Solution

Verified by Experts

The correct Answer is:
A
`[H^(+)]=K_(In)xx(["Hin"])/(["In"^(-)])`
Case` I [H^(+)]_(1)=3xx10^(-5)xx(0.75)/(0.25)=9xx10^(-5)`
Case `II [H^(+)]_(2)=3xx10^(-5)xx(0.25)/(0.75)=1xx10^(-5)`
Change in`[H^(+)]=8xx10^(-5)`
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