Sulfanilic acid

Sulfanilic acid
Names
	Preferred IUPAC name 4-Aminobenzene-1-sulfonic acid
	Other names 4-Aminobenzenesulfonic acid; p-Aminobenzenesulfonic acid; Sulfanilic acid (not retained)
Identifiers
CAS Number	121-57-3 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:27500 ;
ChEMBL	ChEMBL1566888;
ChemSpider	8166;
ECHA InfoCard	100.004.075
EC Number	204-482-5;
Gmelin Reference	101735
KEGG	101735 ;
PubChem CID	8479;
UNII	434Z8C2635 ;
UN number	2585
CompTox Dashboard (EPA)	DTXSID6024464 ;
	InChI InChI=1S/C6H7NO3S/c7-5-1-3-6(4-2-5)11(8,9)10/h1-4H,7H2,(H,8,9,10) Key: HVBSAKJJOYLTQU-UHFFFAOYSA-N; InChI=1/C6H7NO3S/c7-5-; 1-3-6(4-2-5)11(8,9)10/h1-4H,; 7H2,(H,8,9,10)/f/h8H;
	SMILES OS(=O)(=O)c1ccc(N)cc1;
Properties
Chemical formula	C6H7NO3S
Molar mass	173.19
Density	1.485
Melting point	288 °C (550 °F; 561 K)
Solubility in water	12.51 g/L
Acidity (pKa)	3.23 (H2O)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H317, H319
Precautionary statements	P261, P264, P264+P265, P272, P280, P302+P352, P305+P351+P338, P321, P332+P317, P333+P317, P337+P317, P362+P364, P501
Related compounds
Related sulfonic acids	Benzenesulfonic acid; p-Toluenesulfonic acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sulfanilic acid (4-aminobenzenesulfonic acid) is an organic compound with the formula H₃NC₆H₄SO₃. It is an off-white solid. It is a zwitterion, which explains its high melting point. It is a common building block in organic chemistry.

Names



Preferred IUPAC name 4-Aminobenzene-1-sulfonic acid
Other names 4-Aminobenzenesulfonic acid p-Aminobenzenesulfonic acid Sulfanilic acid (not retained)
Identifiers
CAS Number	121-57-3^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:27500^N
ChEMBL	ChEMBL1566888
ChemSpider	8166
ECHA InfoCard	100.004.075
EC Number	204-482-5
Gmelin Reference	101735
KEGG	101735^N
PubChem CID	8479
UNII	434Z8C2635^Y
UN number	2585
CompTox Dashboard (EPA)	DTXSID6024464
InChI InChI=1S/C6H7NO3S/c7-5-1-3-6(4-2-5)11(8,9)10/h1-4H,7H2,(H,8,9,10) Key: HVBSAKJJOYLTQU-UHFFFAOYSA-N InChI=1/C6H7NO3S/c7-5- 1-3-6(4-2-5)11(8,9)10/h1-4H, 7H2,(H,8,9,10)/f/h8H
SMILES OS(=O)(=O)c1ccc(N)cc1
Properties
Chemical formula	C₆H₇NO₃S
Molar mass	173.19
Density	1.485
Melting point	288 °C (550 °F; 561 K)
Solubility in water	12.51 g/L
Acidity (pK_a)	3.23 (H₂O)
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H317, H319
Precautionary statements	P261, P264, P264+P265, P272, P280, P302+P352, P305+P351+P338, P321, P332+P317, P333+P317, P337+P317, P362+P364, P501
Related compounds
Related sulfonic acids	Benzenesulfonic acid p-Toluenesulfonic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references