Methanesulfonic acid

Methanesulfonic acid
Structural formula of methanesulfonic acid
Ball-and-stick model of methanesulfonic acid
Names
Preferred IUPAC name
Methanesulfonic acid
Other names
Methylsulfonic acid, MSA; Mesylic acid
Identifiers
3D model (JSmol)
1446024
ChEBI
ChemSpider
ECHA InfoCard 100.000.817 Edit this at Wikidata
EC Number
  • 200-898-6
1681
UNII
UN number 2585
  • InChI=1S/CH4O3S/c1-5(2,3)4/h1H3,(H,2,3,4) checkY
    Key: AFVFQIVMOAPDHO-UHFFFAOYSA-N checkY
  • 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
  • O=S(=O)(O)C
Properties
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
miscible
Solubility Miscible with methanol, diethyl ether.
Immiscible with hexane
log P −2.424[1]
Acidity (pKa) −1.9[2]
Hazards
GHS labelling:
GHS05: Corrosive
Danger
H314
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).
checkY verify (what is checkY☒N ?)

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).[3]

  1. ^ Towler, Christopher S.; Li, Tonglei; Wikström, Håkan; Remick, David M.; Sanchez-Felix, Manuel V.; Taylor, Lynne S. (December 2008). "An Investigation into the Influence of Counterion on the Properties of Some Amorphous Organic Salts". Molecular Pharmaceutics. 5 (6): 946–955. doi:10.1021/mp8000342. PMID 19434850.
  2. ^ Guthrie, J. Peter (September 1978). "Hydrolysis of esters of oxy acids: pKa values for strong acids; Brønsted relationship for attack of water at methyl; free energies of hydrolysis of esters of oxy acids; and a linear relationship between free energy of hydrolysis and pKa holding over a range of 20 pK units". Canadian Journal of Chemistry. 56 (17): 2342–2354. doi:10.1139/v78-385.
  3. ^ Gernon, M. D.; Wu, M.; Buszta, T.; Janney, P. (1999). "Environmental benefits of methanesulfonic acid: comparative properties and advantages". Green Chemistry. 1 (3): 127–140. doi:10.1039/a900157c.