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Acids and Bases

Is an indicator a substance which changes colors in acids and bases?

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December 12, 2015 12:12AM

Most indicators we meet in early science are acid base indicators and conform to this definition. However there are other types of indicator which can show up other types of chemical. For instance we use diphenylamine to show up the end point of the reaction between Fe2+ and potassium dichromate, and lead acetate paper to test for hydrogen sulfide.