If phenolphthalein is used as an indicator which of the following will be observed if excess sodium hydroxide is added to acetic acid?
A) from colorless to pink
B) from red to yellow
C) from pink to colorless
D) from yellow to red

Question

Quizplus · Accepted Answer

Phenolphthalein is colorless in acidic solutions and turns pink in basic solutions. Adding excess sodium hydroxide (a base) to acetic acid will make the solution basic, turning the phenolphthalein pink.

If Phenolphthalein Is Used as an Indicator Which of the Following