define universal indicator.mention it one use
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A universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. ... Experiments with Yamada's universal indicator are also described in the Journal of Chemical Education...
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Universal indicator : A mixture of several indicators.The universal indicator shows different colours at different concentrations of hydrogen ions in a solution.
A scale for measuring hydrogen ion concentration in a solution, called pH scale has been developed.
On the pH scale we can measurepH generally from 0(very acidic) to 14(very alkaline) .Generally paper impregnated withthe universal indicator is usedfor measuring pH.
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