Phenolphthalein has often been used to monitor the progress of acid-base neutralization reactions.What color will phenolphthalein be if there is an excess of base present?
A)colorless
B)green
C)pink
D)yellow

Question

Quizplus · Accepted Answer

Phenolphthalein is used as an indicator in acid-base titrations. The color of phenolphthalein changes from colorless to pink as the pH changes from acidic to slightly basic. If there is an excess of base present, the solution will become even more basic and the phenolphthalein will turn a deeper shade of pink. Therefore, the best choice is C, pink.

Phenolphthalein Has Often Been Used to Monitor the Progress of Acid-Base