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