The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration is?
A
colourless
B
orange
C
pink
D
yellow
Verified Correct Answer: C.
Chemical Principles & Mechanism
Phenolphthalein is one of the most commonly-used indicators in neutralisation titration.
Phenolphthalein is naturally colorless but turns pink in alkaline solutions.
Source: WAEC / JAMB / NECO Classroom Archive (Record #37613)