Question

A student puts a drop of acetic acid first on a blue litmus paper and then on a red litmus paper. He would observe that

Answer 1

the blue litmus paper will change into red

Answer 2

Acetic acid litmus test

Explanation:

Acetic acid can be tested using the following two options:

1. Acetic acid is a weak base with chemical formula CH3COOH. We use two tests to identify acetic acid. One is the litmus test and the other is the carbon dioxide test. When a student puts a drop of acetic acid on a blue litmus paper, the litmus paper would turn to red colour. Thus proving that the chemical is an acid with pH less than 7.
2. When acetic acid is dropped on red litmus paper, there is no change in colour. It remains red.