Specification Product Name METHYL RED SODIUM SALT Synonyms [2-[4-(Dimethylamino)phenyl azo] Benzoic Acid] C. I. No. 13020 CAS NO. 493-52-7 Molecular Formula C15H14N3NaO2 Formula Weight 291.29 Appearance Yellow Powder Structure     Tests    Limits Solubility 0.1% (dist. Water) - Clear reddish – yellow solution Absorptivity 1%/1cm, (pH 6.2) at λ max.430.0 nm (pH 4.2) at λ max.527.0 nm - 675-735 - 1200-1300 Loss on drying at 110°C (1hr) - < 5%         REVISED: 1-1-2012