An acid-base indicator has \( \mathrm{K}_{\mathrm{HIn}}=3.0 \times 10^{-5} \), The acid form of ....

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An acid-base indicator has \( \mathrm{K}_{\mathrm{HIn}}=3.0 \times 10^{-5} \), The acid
\( \mathrm{P} \)
form of the indicator is red and the basic form is blue. The change in \( \left[\mathrm{H}^{+}\right] \)required to change the indicator from \( 75 \% \) red to \( 75 \% \) blue is:
(1) \( 8 \times 10^{-5} \mathrm{M} \)
(2) \( 9 \times 10^{-5} \mathrm{M} \)
(3) \( 1 \times 10^{-5} \mathrm{M} \)
(4) \( 3 \times 10^{-4} \mathrm{M} \)


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