Ethanesulfonic acid

Ethanesulfonic acid (esylic acid) is a sulfonic acid with the chemical formula C₂H₆O₃S or CH₃CH₂SO₃H. The conjugate base is known as ethanesulfonate or, when used in pharmaceutical formulations, as esilate. It is a colorless liquid.^[2]

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Ethanesulfonic acid

Names
Preferred IUPAC name Ethanesulfonic acid
Other names Esylic acid, ethylsulfonic acid
Identifiers
CAS Number	594-45-6 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:42465 Y
ChemSpider	11178 N
ECHA InfoCard	100.008.950
EC Number	209-843-0
PubChem CID	11668
UNII	599310E3U2 Y
CompTox Dashboard (EPA)	DTXSID5060487
InChI InChI=1S/C2H6O3S/c1-2-6(3,4)5/h2H2,1H3,(H,3,4,5) InChI=1S/C2H6O3S/c1-2-6(3,4)5/h2H2,1H3,(H,3,4,5) Key: CCIVGXIOQKPBKL-UHFFFAOYSA-N
SMILES CCS(O)(=O)=O
Properties
Chemical formula	C2H6O3S
Molar mass	110.13 g·mol−1
Appearance	Colorless liquid
Density	1.35 g/mL
Melting point	−17 °C (1 °F; 256 K)
Boiling point	122–123 °C (252–253 °F; 395–396 K) at 0.01 mmHg
Solubility in water	Soluble
log P	−0.37
Acidity (pKa)	−1.68[1]
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H290, H302, H302+H312, H312, H314, H335
Precautionary statements	P234, P260, P264, P264+P265, P270, P271, P280, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P319, P321, P330, P362+P364, P363, P390, P403+P233, P405, P501
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

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