Bromophenol blue changes from yellow to blue over the pH range of 3.0 to 4.6. Which statement is correct?

A.     Molecules of bromophenol blue, HIn, are blue.

B.     At ${\text{pH}} < 3.0$, a solution of bromophenol blue contains more ions, ${\text{I}}{{\text{n}}^ - }$, than molecules, HIn.

C.     The ${\text{p}}{K_{\text{a}}}$ of bromophenol blue is between 3.0 and 4.6.

D.     Bromophenol blue is a suitable indicator to titrate ethanoic acid with potassium hydroxide

solution.

C