Question

what is the change you observe in litmus paper with acid and bases​

Answer 1

Answer:

acids(pH<7) change blue litmus to red whereas bases (pH>7)change red litmus to blue.

Answer 2

In acids:-

The blue litmus paper turns red if the solution is acidic.

Bases or Alkalis:-

The red litmus paper turns blue if the solution is basic or alkaline.