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Sulfanilic acid

Sulfanilic acid Structure
Sulfanilic acid
  • CAS No.121-57-3
  • Chemical Name:Sulfanilic acid
  • CBNumber:CB1489237
  • Molecular Formula:C6H7NO3S
  • Formula Weight:173.19
  • MOL File:121-57-3.mol
Sulfanilic acid Property
  • Melting point: :>300 °C(lit.)
  • Density  :1.485
  • refractive index  :1.5500 (estimate)
  • storage temp.  :Store below +30°C.
  • solubility  :10g/l
  • form  :solid
  • pka :3.24(at 25℃)
  • PH :2.5 (10g/l, H2O, 20℃)
  • Water Solubility  :0.1 g/100 mL (20 ºC)
  • Merck  :14,8926
  • BRN  :908765
  • Stability: :Stable. Incompatible with strong oxidizing agents.
  • InChIKey :HVBSAKJJOYLTQU-UHFFFAOYSA-N
  • Indirect Additives used in Food Contact Substances :SULFANILIC ACID
  • FDA 21 CFR :176.180
  • CAS DataBase Reference :121-57-3(CAS DataBase Reference)
  • FDA UNII :434Z8C2635
  • NIST Chemistry Reference :Benzenesulfonic acid, 4-amino-(121-57-3)
  • EPA Substance Registry System :Sulfanilic acid (121-57-3)
Safety
Hazard and Precautionary Statements (GHS)
  • Symbol(GHS)
  • Signal wordDanger
  • Hazard statements H314-H315-H317-H319
  • Precautionary statements P280a-P321-P333+P313-P501a-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338-P261-P264-P272-P302+P352+P333+P313+P363-P305+P351+P338+P337+P313-P501
Sulfanilic acid Price More Price(29)
  • Brand: Sigma-Aldrich
  • Product number: 8.22338
  • Product name : Sulfanilic acid
  • Purity: for synthesis
  • Packaging: 100 g
  • Price: $23.12
  • Updated: 2021/03/22
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  • Brand: Sigma-Aldrich
  • Product number: 251917
  • Product name : Sulfanilic acid
  • Purity: ACS reagent, 99%
  • Packaging: 25g
  • Price: $26.3
  • Updated: 2021/03/22
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  • Brand: Sigma-Aldrich
  • Product number: 39441
  • Product name : Nitrate Reagent B
  • Purity: suitable for microbiology
  • Packaging: 100 mL
  • Price: $36
  • Updated: 2021/03/22
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  • Brand: Sigma-Aldrich
  • Product number: 1.00684
  • Product name : Sulfanilic acid
  • Purity: for elemental analysis
  • Packaging: 5 g
  • Price: $65.12
  • Updated: 2021/03/22
  • Buy: Buy
  • Brand: Sigma-Aldrich
  • Product number: 8.22338
  • Product name : Sulfanilic acid
  • Purity: for synthesis
  • Packaging: 1 kg
  • Price: $67.43
  • Updated: 2021/03/22
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Sulfanilic acid Chemical Properties,Usage,Production

  • Description Sulfanilic acid (4-amino benzene sulfonic acid ) is an off-white crystalline solid which finds application in quantitative analysis of nitrate and nitrite ions. The solid acid exists as a zwitterion, and has an unusually high melting point.
  • Chemical Properties greyish-white crystals or powder
  • Uses A toxic metabolite of Tartrazine (T007700). Used as Ehrlich’s reagent, for detecting of nitrites. Antibacterial.
  • Definition ChEBI: An aminobenzenesulfonic acid that is aniline sulfonated at the para-position.
  • Application As the compound readily form diazo compounds, it is used to make dyes and sulpha drugs . This property is also used for the quantitative analysis of nitrate and nitrite ions by diazonium coupling reaction with N-(1-Naphthyl) ethylene diamine , resulting in an azo dye, and the concentration of nitrate or nitrite ions were deduced from the color intensity of the resulting red solution by colorimetry.
    It is also used as a standard in combustion analysis.
  • General Description White powder with faint purple tinge. Grayish-white flat crystals. Becomes anhydrous at around 212°F. Low toxicity (used medicinally).
  • Air & Water Reactions Insoluble in water.
  • Reactivity Profile Sulfanilic acid is an amino acid. Reacts weakly with both acids and bases.
  • Fire Hazard Flash point data for Sulfanilic acid are not available, however Sulfanilic acid is probably combustible.
  • Chemical Synthesis Sulfanilic acid can be produced by sulfonation of aniline.
  • Purification Methods Crystallise the acid (as dihydrate) from boiling water. Dry it at 105o for 2-3hours, then over 90% H2SO4 in a vacuum desiccator. The S-benzylisothiuronium salt has m 187o (from aqueous EtOH). [Beilstein 14 IV 2655.]
Sulfanilic acid Preparation Products And Raw materials
Raw materials
Preparation Products
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