Question

A solution turns red litmus blue and turns phenolphthalein solution pink. The solution is a acid or a base?

Answer 1

Indicators

Indicators are used to identify whether the given substance is acid or base.

Phenolphthalein is an organic compound and is used as an acid-base indicator.

The indicator phenopthaline gives pink color to acid solution and is colorless in an acidic medium.

Litmus paper

• Litmus paper is a strip of paper extracted from lichens, which is dipped into a solution to determine if it is an acid or base.
• Litmus papers are generally available in two colors, red and blue.
• Acidic solution blue litmus changes to red color in basic solution red litmus changes to blue color.

Hence, the solution is a base.