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Methyl red, C.I. 13020, indicator

- Synonyms: 2-[(4-Dimethylamino)phenylazo]benzoic acidr- C15H15N3O2r- M = 269,31 g/molr- CAS [493-52-7]r- EINECS-No.: 207-776-1r- Solub. in water: (20 ºC): sligthly solubler- Melting point: 178 - 182 ºCr- Tariff number: 2927 00 00 90r- Applications: analytical chemistry, indicator.rrSPECIFICATIONSrrbrownish - yellow ): 4,5 - 6,2 rAbsorption maximum l1 (pH 4,5): 523 - 526 nm rAbsorption maximum l2 (pH 6,2): 427 - 437 nm rAbsorptivity (A1%/1 cm; l1; pH 4,5 on dried sample): 1380 - 1480 rAbsorptivity (A1%/1 cm; l2; pH 6,2 on dried sample): 700 - 800 rtransition range acc. ACS: passes testrloss on drying (110 ºC): max. 5 % r