what is a universal indicator?
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a mixture of dyes that changes colour gradually over a range of pH and is used (especially as indicator paper) in testing for acids and alkalis.
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Universal indicator is a mixture of many indicators which gives diferent colours at different pH values of entire scale. It shows different colours at different concentration of ions in the solution. A drop of the solution to be tested is put on a strip of universal indicator paper.It then undergoes a colour change.
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