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Calconcarboxylic acid diazenyl]naphthalene-2-carboxylic acid; commonly called Patton and Reeder's Indicator] is an azo dye that is used as an indicator for complexometric titrations of calcium with ethylenediaminetetraacetic acid in the presence of magnesium. Structurally, it is similar to eriochrome blue black R, which is obtained from calconcarboxylic acid by decarboxylation and reaction with sodium hydroxide.
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