90-11-3 MSDS - Phenylsulfonic acid
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Phenylsulfonic acid

Name Phenylsulfonic acid
CAS Registry Number 90-11-3
Synonyms Phenylsulfonic acid;Bonzenesulfonic acid
Molecular Structure Phenylsulfonic acid  90-11-3
Molecular Formula C6H6O3S
Molecular Weight 158.17504
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Wiki & MSDS
Benzenesulfonic acid[1]
Skeletal formula of benzenesulfonic acid
Ball-and-stick model of the benzenesulfonic acid molecule
Preferred IUPAC name
Benzenesulfonic acid
Other names
Benzene sulphonic acid; Benzenesulphonic acid; Phenylsulfonic acid; Phenylsulphonic acid; Besylic acid[2]
CAS Number
  • 98-11-3 YesY
3D model (JSmol)
  • Interactive image
  • 7093 YesY
ECHA InfoCard 100.002.399
  • 685928Z18A YesY
Chemical formula
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
Solubility in other solvents Soluble in alcohol, insoluble in non-polar solvents
Acidity (pKa) −2.8[3]
Main hazards Corrosive
Safety data sheet External MSDS
R-phrases (outdated) R20 R22 R34 R36 R37 R38
S-phrases (outdated) S26 S36/37/39 S45
Flash point > 113 °C
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).
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Infobox references

Benzenesulfonic acid (conjugate base benzenesulfonate) is an organosulfur compound with the formula C6H5SO3H. 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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