Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions

• GC Acids Bases Salts

Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are

1. red and blue.
2. blue and red.
3. pink and colourless.
4. colourless and pink.

Answer

Phenolphthalein remains colourless in acidic solution but turns pink in basic solution.

The correct option is D.