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CAS No 523-44-4 , Acid Orange 20 Search by region : China

  • Name: Acid Orange 20
  • Synonyms: alpha-Naphthol Orange; Orange I;alpha-Naphthol orange;Acid Orange 20;Sodium 4-[(4-hydroxy-1-naphthyl)azo]benzenesulfonate;
  • CAS Registry Number:
  • Flash Point: °C
  • Boiling Point: °Cat760mmHg
  • Density: g/cm3
  • Safety Statements: Low toxicity by ingestion. Questionable carcinogen with experimental tumorigenic data. Mutation data reported. When heated to decomposition it emits very toxic fumes of NOx, SOx, and Na2O.
  • Flash Point: °C
  • EINECS: 208-346-6
  • Molecular Weight: 350.32
  • InChI: InChI=1/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;/h1-10,19H,(H,20,21,22);/q;+1/p-1/b18-17+;
  • Risk Statements: S22;S24/25
  • Molecular Formula: C16H11N2NaO4S
  • Molecular Structure:CAS No:523-44-4 Acid Orange 20

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References of Acid Orange 20
Title: Orange I
CAS Registry Number: 523-44-4
CAS Name: 4-[(4-Hydroxy-1-naphthalenyl)azo]benzenesulfonic acid monosodium salt
Synonyms: Tropaeolin OOO no. 1; C.I. Acid Orange 20; FD & C Orange I; Ext. D & C Orange 3; C.I. 14600; a-naphthol orange; sodium azo-a-naphtholsulfanilate
Molecular Formula: C16H11N2NaO4S
Molecular Weight: 350.32
Percent Composition: C 54.86%, H 3.16%, N 8.00%, Na 6.56%, O 18.27%, S 9.15%
Literature References: Prepared by coupling diazotized sulfanilic acid with a-naphthol: Colour Index vol. 4 (3rd ed., 1971) p 4065.
Properties: Reddish-brown powder. Sol in water to orange-red soln, in alcohol to orange soln. Acids ppt the aq soln. Sodium hydroxide intensifies the red color of the aq soln. pH: 7.6 brownish-yellow; 8.9 purple.