Question

What are universal indicators?

Answer 1

a mixture of dyes that changes colour gradually over a range of pH and is used (especially as indicator paper) in testing for acids 

Answer 2

Universal indicator is regarded as the pH paper which is a scale of colour which indicates whether a solution is strong acid, weak acid, neutral, strong base or a weak base. The pH scale or paper are impregnated with the universal indicator.This gives different colours with different concentration of H+ ion or OH- ions.The colour obtained id then matched with a pH scale.

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