Two drops of indicator HIn (left(K_{mathrm{a}}=1.0 times 10^{-9}ight)), where HIn is yellow and (mathrm{In}^{-})is blue, are placed

Question:

Two drops of indicator HIn $\left(K_{\mathrm{a}}=1.0 \times 10^{-9}ight)$, where HIn is yellow and $\mathrm{In}^{-}$is blue, are placed in $100.0 \mathrm{~mL}$ of $0.10 \mathrm{M} \mathrm{HCl}$.

a. What color is the solution initially?
b. The solution is titrated with $0.10 \mathrm{M} \mathrm{NaOH}$. At what $\mathrm{pH}$ will the color change (yellow to greenish yellow) occur?
c. What color will the solution be after $200.0 \mathrm{~mL}$ of $\mathrm{NaOH}$ has been added?

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