Chicago Acid is a chemical compound that is used by analytical chemistry as a pH indicator. It is an organic compound that dissolves in water and is frequently used to assess the acidity or alkalinity of solutions with a pH between 2.0 and 4.5. ANDSA is a pH indicator used in analytical chemistry to assess the acidity of solutions. Because Chicago Acid is an azo dye, it has an azo group, a nitrogen-nitrogen double bond, connecting two aromatic rings. It has a melting point of roughly 230-240C and is a reddish-brown powder that is soluble in water.
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