Methyl red, C.I. 13020, indicator

- Synonyms: 2-[(4-Dimethylamino)phenylazo]benzoic acid
- C15H15N3O2
- M = 269,31 g/mol
- CAS [493-52-7]
- EINECS-No.: 207-776-1
- Solub. in water: (20 ºC): sligthly soluble
- Melting point: 178 - 182 ºC
- Tariff number: 2927 00 00 90
- Applications: analytical chemistry, indicator.

SPECIFICATIONS

brownish - yellow ): 4,5 - 6,2
Absorption maximum l1 (pH 4,5): 523 - 526 nm
Absorption maximum l2 (pH 6,2): 427 - 437 nm
Absorptivity (A1%/1 cm; l1; pH 4,5 on dried sample): 1380 - 1480
Absorptivity (A1%/1 cm; l2; pH 6,2 on dried sample): 700 - 800
transition range acc. ACS: passes test
loss on drying (110 ºC): max. 5 %