Question

a substance change colour in acid medium another colour in base medium .Name that substance ​

Answer 1

Answer:

The substance that changes its colour when tested in an acid or a base is called as an indicator.They can be either natural ir synthetic.

Answer 2

Answer:

I think the substance is litmus paper

A blue litmus paper turns red when exposed to acid medium and a red litmus paper turns blue when exposed to a basic medium