How does diphenylamine act as a redox indicator?
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Many diphenylamine derivatives are used as redox indicators that are particularly useful in alkaline redox titrations. ... In a related application, diphenylamine is oxidized by nitrate to give a similar blue coloration in the diphenylamine test for nitrates.
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Diphenylamne is used as an indicator because it shows a very clear color change from green to violet when end point of the titration is reached.
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