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CAS No 547-58-0 , Methyl Orange

  • Name: Methyl Orange
  • Synonyms: Methyl orange sodium salt; Acid Orange 52; sodium 4-(4-dimethylaminophenylazo)benzenesulphonate; Helianthise;4-[4-(Dimethylamino)phenylazo]benzenesulfonic acid, sodium salt; Sodium 4-(4-dimethylaminophenylazo)benzenesulphonate;Methyl Orange; methyl orange for microscopy; METHYL ORANGE SODIUM SALT; Acid Orange 52 C.I. 13025; MO; Methyl Orange solution; C.I. 13025;C.I. 13025; 4-Dimethylaminoazobenzene-4-sulfonic acid, sodium salt;
  • CAS Registry Number:
  • Transport: UN 2811
  • Melting Point: 300 ºC
  • Flash Point: °C
  • Density: 0.987 g/mL at 25 °C
  • Water Solubility: slight
  • Safety Statements: R10
  • Hazard Symbols: T:Toxic;
  • Flash Point: °C
  • EINECS: 208-925-3
  • Molecular Weight: 327.33
  • InChI: InChI=1/C14H15N3O3S.Na/c1-17(2)13-7-3-11(4-8-13)15-16-12-5-9-14(10-6-12)21(18,19)20;/h3-10H,1-2H3,(H,18,19,20);/q;+1/p-1/b16-15+;
  • Risk Statements: S16;S24/25
  • Molecular Formula: C14H14N3NaO3S
  • Molecular Structure:CAS No:547-58-0 Methyl Orange

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References of Methyl Orange
Title: Methyl Orange
CAS Registry Number: 547-58-0
CAS Name: 4-[[(4-Dimethylamino)phenyl]azo]benzenesulfonic acid sodium salt
Synonyms: sodium p-dimethylaminoazobenzenesulfonate; helianthine B; C.I. Acid Orange 52; C.I. 13025; Orange III; Gold Orange; Tropaeolin D
Molecular Formula: C14H14N3NaO3S
Molecular Weight: 327.33
Percent Composition: C 51.37%, H 4.31%, N 12.84%, Na 7.02%, O 14.66%, S 9.80%
Literature References: Prepn from sulfanilic acid sodium nitrite + dimethylaniline: L. Gattermann, Die Praxis des Organischen Chemikers (de Gruyter, Berlin, 40th ed., 1961) pp 260-261. See also Colour Index vol. 4 (3rd ed., 1971) p 4043.
Properties: Orange-yellow powder or cryst scales. Sol in 500 parts water; more sol in hot water. Practically insol in alcohol.
Use: As indicator in 0.1% aq soln. pH: 3.1 red, 4.4 yellow. Employed for titrating most mineral acids, strong bases, estimating alkalinity of waters; useless for organic acids. In dyeing and printing of textiles.