An acid indicator \( \mathrm{HIn} \) has \( \mathrm{K}_{\mathrm{a}}=3 \times 10^{-5} \), the aci....

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An acid indicator \( \mathrm{HIn} \) has \( \mathrm{K}_{\mathrm{a}}=3 \times 10^{-5} \), the acid form
\( \mathrm{P} \)
is red and basic form is blue. Which is correct?
(1) \( \mathrm{pH}=5 \) when indicator is \( 75 \% \) red
(2) \( \mathrm{pH}=4.05 \) when indicator is \( 75 \% \) red
(3) \( \mathrm{pH}=5 \) when indicator is \( 75 \% \) blue
(4) \( \mathrm{pH}=4.05 \) when indicator is \( 75 \% \) blue


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