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An acid base indicator has Ka of 3xx10^-...

An acid base indicator has `K_a` of `3xx10^-5`. The acid form of the indicator is red and the basic form is blue. By how much must the pH change in order to change the indicator from `75%` red to `75 %` blue?

A

1.95

B

2.95

C

0.95

D

3.95

Text Solution

Verified by Experts

The correct Answer is:
C
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