Question

phenolphthalein solution is used as an indicator of acids and bases. if added to an ammonia-based solution of window cleaner, we would expect the solution to turn a blue. b brown. c pink. d yellow.

Explanation:

Phenolphthalein is a pH indicator. It's colorless in acidic/neutral solutions and pink in basic solutions. Ammonia - based window cleaner is basic. So phenolphthalein will turn the solution pink.

Answer:

C. pink.