Question

# Phenolphthalein gives which of the following colours in basic salt?(A) Blue(B) Red(C) Pink(D) Purple

Hint: In the presence of acidic medium, phenolphthalein has a structure that does not impart any colour properties to the solution. The colour of phenolphthalein in basic medium is not a primary colour.

First of all, let’s get basic information about phenolphthalein. Phenolphthalein has a formula of ${{C}_{20}}{{H}_{14}}{{O}_{4}}$ . We should know that it is an organic compound of the phthalein family that is widely used as an acid-base indicator.