Acid orange 20

"Orange I" redirects here. For the synod, see Council of Orange (441).
Acid orange 20
Names
IUPAC name
Sodium 4-[2-(4-oxonaphthalen-1-ylidene)hydrazin-1-yl]benzenesulfonate
Other names
Orange I, 4-[(4-hydroxy-1-naphthalenyl)azo]benzenesulfonic acid, monosodium salt
sodium 4-[(4-hydroxy-1-naphthalenyl)azo]benzenesulfonate
Identifiers
3D model (JSmol)
3826844
ChEBI
ChemSpider
ECHA InfoCard 100.007.589 Edit this at Wikidata
EC Number
  • 208-346-6
RTECS number
  • DB7085000
UNII
  • InChI=1S/C16H12N2O4S.Na/c19-16-10-9-15(13-3-1-2-4-14(13)16)18-17-11-5-7-12(8-6-11)23(20,21)22;/h1-10,17H,(H,20,21,22);/q;+1/p-1 checkY
    Key: HMWJVUNISIEXFR-UHFFFAOYSA-M checkY
  • [Na+].[O-]S(=O)(=O)C1=CC=C(NN=C2C=CC(=O)C3=C2C=CC=C3)C=C1
Properties
C16H11N2NaO4S
Molar mass 350.32 g·mol−1
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g. sodium chlorideFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
0
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Acid orange 20 (also Orange I) is an organic compound and an azo dye. It is one of the first water soluble dyes to be commercialized, and one of seven original food dyes allowed under the U.S. Pure Food and Drug Act of June 30, 1906. It is analyzed by HPLC.[1]

  1. ^ Yoshioka, N.; Ichihashi, K. (2008). "Determination of 40 synthetic food colors in drinks and candies by high-performance liquid chromatography using a short column with photodiode array detection". Talanta. 74 (5): 1408–1413. doi:10.1016/j.talanta.2007.09.015. PMID 18371797.