page_title: Calconcarboxylic acid
hierarchical_section_title: Calconcarboxylic acid
caption_attribution_description: English: Diagram showing 2D chemical structure of calconcarboxylic acid
context_page_description: Calconcarboxylic acid is an azo dye which 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.
context_section_description: Calconcarboxylic acid (IUPAC name 3-hydroxy-4-[(2-hydroxy-4-sulfonaphthalen-1-yl)diazenyl]naphthalene-2-carboxylic acid; commonly called Patton and Reeder's Indicator) is an azo dye (chemical formula CH₃CHOHCH₃) which is used as an indicator for complexometric titrations of calcium with ethylenediaminetetraacetic acid (EDTA) 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.
caption: Calconcarboxylic acid 2D structure
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