An acid-base indicator has a K(a) of 3.0...

An acid-base indicator has a `K_(a)` of `3.0 xx 10^(-5)`. The acid form of the indicator is red and the basic form is blue. (a) By how much must the `pH` change in order to change the indicator from `75%` red to `75%` blue?

0.95

2.3

0.75

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