What is an indicator ? Name three indicators.
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An indicator is a substance whose colour changes in order to indicate a chemical reaction. Indicators usually indicate the pH of a solution or whether or not a reaction is a redox reaction or not.
Litmus is a pH indicator, as is universal indicator and phenolphthalein.
The most commonly used redox indicator is Methylene blue.
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An indicator is a 'dye' that changes colour when it is put in an acid or a base. The three most common indicators are: Litmus, Methyl orange and Phenolphthalein..
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