An acid-base indicator has \( K_{\mathrm{HIn}}=3.0 \times 10^{-5} \). The acid form of the indic...

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An acid-base indicator has \( K_{\mathrm{HIn}}=3.0 \times 10^{-5} \). The acid 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 :
(a) \( 8 \times 10^{-5} M \)
(b) \( 9 \times 10^{-5} M \)
(c) \( 1 \times 10^{-5} M \)
(d) \( 3 \times 10^{-4} M \)
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