Benzenesulfonic acid

Benzenesulfonic acid
Names
	Preferred IUPAC name Benzenesulfonic acid
	Other names Benzene sulphonic acid; Benzenesulphonic acid; Phenylsulfonic acid; Phenylsulphonic acid; Besylic acid
Identifiers
CAS Number	98-11-3 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:64455;
ChEMBL	ChEMBL1422641;
ChemSpider	7093 ;
ECHA InfoCard	100.002.399
EC Number	202-638-7;
PubChem CID	7371;
RTECS number	DB4200000;
UNII	685928Z18A ;
UN number	2583, 2585, 1803
CompTox Dashboard (EPA)	DTXSID9024568 ;
	InChI InChI=1S/C6H6O3S/c7-10(8,9)6-4-2-1-3-5-6/h1-5H,(H,7,8,9) Key: SRSXLGNVWSONIS-UHFFFAOYSA-N ; InChI=1/C6H6O3S/c7-10(8,9)6-4-2-1-3-5-6/h1-5H,(H,7,8,9) Key: SRSXLGNVWSONIS-UHFFFAOYAJ;
	SMILES OS(=O)(=O)c1ccccc1;
Properties
Chemical formula	C6H6O3S
Molar mass	158.17 g·mol−1
Appearance	Colorless crystalline solid
Density	1.32 g/cm3 (47 °C)
Melting point	44 °C (hydrate); 51 °C (anhydrous);
Boiling point	190 °C (374 °F; 463 K)
Solubility in water	Soluble
Solubility in other solvents	Soluble in alcohol, insoluble in non-polar solvents
Acidity (pKa)	−2.8
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H290, H302, H314, H315, H319, H335
Precautionary statements	P234, P260, P261, P264, P270, P271, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P330, P332+P313, P337+P313, P362, P363, P390, P403+P233, P404, P405, P501
Flash point	> 113 °C
Safety data sheet (SDS)	External MSDS
Related compounds
Related sulfonic acids	Sulfanilic 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

Benzenesulfonic acid (conjugate base benzenesulfonate) is an organosulfur compound with the formula C₆H₆O₃S. It is the simplest aromatic sulfonic acid. It forms white deliquescent sheet crystals or a white waxy solid that is soluble in water and ethanol, slightly soluble in benzene and insoluble in nonpolar solvents like diethyl ether. It is often stored in the form of alkali metal salts. Its aqueous solution is strongly acidic.

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