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Properties of substance:

chlorosulfonic acid

Group of substances:

inorganic

Physical appearance:

colorless fuming liquid

Empirical formula (Hill's system for organic substances):

HClO3S

Structural formula as text:

HSO3Cl

Molar/atomic mass: 116.52

Melting point (°C):

-80.5

Boiling point (°C):

151

Decomposition temperature (°C):

151

Solubility (g/100 g of solvent):

1,1,2,2-tetrachloroethane: soluble [Ref.]
acetic acid: soluble [Ref.]
acetic anhydride: soluble [Ref.]
carbon disulphide: sparingly soluble [Ref.]
carbon tetrachloride: sparingly soluble [Ref.]
chloroform: soluble [Ref.]
ethanol: reaction [Ref.]
methylene chloride: soluble [Ref.]
nitrobenzene: soluble [Ref.]
pyridine: soluble [Ref.]
sulfur dioxide: soluble [Ref.]
sulfuryl chloride: soluble [Ref.]
trifluoroacetic acid: soluble [Ref.]
trifluoroacetic acid anhydride: soluble [Ref.]
water: reaction [Ref.]

Numerical data:

Year of discovery: 1854

Density:

1.77 (18°C, g/cm3)

Reactions:

  1. [Ref.1]
    CH3COCl + ClSO3H → CH3COOSO2Cl + HCl
  2. [Ref.1]
    C6H5CH2OH + ClSO3H + C5H5N → C6H5CH2OSO3H + C5H5N * HCl

Vapour pressure (Torr):

1 (32°C)
10 (64°C)
100 (105.3°C)

Dissociation:

H0 (1) = -13.8 (20°C, water)
pKa (1) = -10.43 (20°C, water)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-555.2 (l)

References:

  1. CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 4-92
  2. Cremlyn R.J. Chlorosulfonic Acid. A Versatile Reagent. - RSC, 2002
  3. Olah G.A., Prakash G.K.S., Molnar A., Sommer J. Superacid chemistry. - 2ed. - Wiley, 2009. - pp. 36-37
  4. Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.3. - Л.: Химия, 1976. - pp. 70 [Russian]
  5. Краткая химическая энциклопедия. - Т. 5: Т-Я. - М.: Советская энциклопедия, 1967. - pp. 725-727 [Russian]
  6. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 98 [Russian]
  7. Соросовский образовательный журнал. - 1998. - №12. - pp. 62 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru