Methanesulfonic acid

Methanesulfonic acid
Names
	Preferred IUPAC name Methanesulfonic acid
	Other names Methylsulfonic acid, MSA; Mesylic acid
Identifiers
CAS Number	75-75-2 ;
3D model (JSmol)	Interactive image;
Beilstein Reference	1446024
ChEBI	CHEBI:27376 ;
ChemSpider	6155 ;
ECHA InfoCard	100.000.817
EC Number	200-898-6;
Gmelin Reference	1681
PubChem CID	6395;
UNII	12EH9M7279 ;
UN number	2585
CompTox Dashboard (EPA)	DTXSID4026422 ;
	InChI InChI=1S/CH4O3S/c1-5(2,3)4/h1H3,(H,2,3,4) Key: AFVFQIVMOAPDHO-UHFFFAOYSA-N ; InChI=1/CH4O3S/c1-5(2,3)4/h1H3,(H,2,3,4)/f/h2H; InChI=1/CH4O3S/c1-5(2,3)4/h1H3,(H,2,3,4) Key: AFVFQIVMOAPDHO-UHFFFAOYAS;
	SMILES O=S(=O)(O)C;
Properties
Chemical formula	CH4O3S
Molar mass	96.10 g·mol−1
Appearance	Clear, colourless liquid
Density	1.48 g/cm3
Melting point	17 to 19 °C (63 to 66 °F; 290 to 292 K)
Boiling point	167 °C (333 °F; 440 K) at 10 mmHg, 122 °C/1 mmHg
Solubility in water	miscible
Solubility	Miscible with methanol, diethyl ether. ; Immiscible with hexane
log P	−2.424
Acidity (pKa)	−1.9
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501
Safety data sheet (SDS)	Oxford MSDS
	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

Methanesulfonic acid (MsOH, MSA) or methanesulphonic acid (in British English) is an organosulfuric, colorless liquid with the molecular formula CH₃SO₃H and structure H₃C−S(=O)₂−OH. It is the simplest of the alkylsulfonic acids (R−S(=O)₂−OH). Salts and esters of methanesulfonic acid are known as mesylates (or methanesulfonates, as in ethyl methanesulfonate). It is hygroscopic in its concentrated form. Methanesulfonic acid can dissolve a wide range of metal salts, many of them in significantly higher concentrations than in hydrochloric acid (HCl) or sulfuric acid (H₂SO₄).