Question

When does phenolphthalein turn pink?

Answer 1

Phenolphthalein turn pink in basic solutions.it turn colourless in acid solution.
Hence options(1)is correct

Answer 2

The correct answer is in the presence of a base.

Step-by-step explanation:

Phenolphthalein is a pH indicator, which is generally colorless, however, it changes from pink to purple when encounters with the alkaline solutions. The compound phenolphthalein functions in a distinct way as it is colorless naturally, however, it turns from pink to dark pinkish color in alkaline solutions. Throughout the range of acidic pH levels, the compound stays colorless, however, it starts to turn pink at the pH of 8.2, that is, basic, and goes towards the bright purple color in stronger alkalines.