What is BDH universal indicator.
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Universal indicator is used to test wheather a solution is acidic or basic. It is a solution of many indicators which shows different colour for the solutions with different pH values.
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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. Although there are several commercially available universal pH indicators, most are a variation of a formula patented by Yamada in 1933.
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