Define universal indicator.
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universal indicator is a test to measure the pH value of a liquid. The solution that is used has several chemical indicators in it. This means that the indicator is able to show different colours (and therefore pH value ranges). The drawback of this solution is that it cannot be used for titrations, which expect a well-defined change in color.
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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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