Chlorosulfuric acid

Chlorosulfuric acid
Structural formula of chlorosulfuric acid
Ball-and-stick model of the chlorosulfuric acid molecule
Names
IUPAC name
Sulfurochloridic acid
Other names
Chlorosulfuric acid,
Chlorosulfonic acid,
Chlorosulphonic acid,
Chlorinesulfonic acid,
Chlorinesulphonic acid,
Chloridosulfonic acid,
Chloridosulphonic acid,
Sulfuric chlorohydrin
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.304 Edit this at Wikidata
EC Number
  • 232-234-6
RTECS number
  • FX5730000
UNII
UN number 1754
  • InChI=1S/ClHO3S/c1-5(2,3)4/h(H,2,3,4) checkY
    Key: XTHPWXDJESJLNJ-UHFFFAOYSA-N checkY
  • InChI=1/ClHO3S/c1-5(2,3)4/h(H,2,3,4)
    Key: XTHPWXDJESJLNJ-UHFFFAOYAO
  • ClS(=O)(=O)O
Properties
HSO3Cl
Molar mass 116.52 g mol−1
Appearance colorless liquid, but commercial samples usually are pale brown
Density 1.753 g cm−3
Melting point −80 °C (−112 °F; 193 K)
Boiling point 151 to 152 °C (304 to 306 °F; 424 to 425 K) (755 mmHg or 100.7 kPa)
hydrolysis
Solubility in other solvents reacts with alcohols
soluble in chlorocarbons
Acidity (pKa) −5.9 (in CF3CO2H)[1]
1.433
Structure
tetrahedral
Hazards
GHS labelling:
GHS05: CorrosiveGHS07: Exclamation mark
Danger
H314, H335
P260, P261, P264, P271, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P363, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazard W+OX: Reacts with water in an unusual or dangerous manner AND is oxidizer
3
0
2
W
OX
Safety data sheet (SDS) ICSC 1039
Related compounds
Related compounds
 Sulfuryl chloride
Sulfuric acid
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 ?)

Chlorosulfuric acid (IUPAC name: sulfurochloridic acid) is the inorganic compound with the formula HSO3Cl. It is also known as chlorosulfonic acid, being the sulfonic acid of chlorine. It is a distillable, colorless liquid which is hygroscopic and a powerful lachrymator. Commercial samples usually are pale brown or straw colored.[3]

Salts and esters of chlorosulfuric acid are known as chlorosulfates.

  1. ^ Perrin, D. D., ed. (1982) [1969]. Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution. IUPAC Chemical Data (2nd ed.). Oxford: Pergamon (published 1984). Entry 32. ISBN 0-08-029214-3. LCCN 82-16524.
  2. ^ "New Environment Inc. - NFPA Chemicals".
  3. ^ Cremlyn, R. J. (2002). Chlorosulfonic Acid. Royal Society of Chemistry. ISBN 978-0-85404-498-6.