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.

C.) pink In a base, with a pH> 8.2, we would expect the indicator to turn pink. Phenolphthalein is colorless in an acidic or neutral solution; it turns from pink to fuchsia in a basic solution. Cleaners and products containing soaps, are bases.