Question

What is litmus paper? How does it work?

Answer 1

Litmus Paper is a indicator for Acid and bases.
Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions.

Answer 2

litmus paper is an acid base indicater which is made of lichens.

it indicates where a solution is acidic or basic .

turns red ---> solution acidic
turns blue ---> solution base