Sulfur dioxide

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Sulfur dioxide
Names
IUPAC name
Sulfur dioxide
Other names
Sulfurous anhydride
Sulfur(IV) oxide
Identifiers
3D model (JSmol)
Beilstein Reference 3535237
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.028.359
EC Number 231-195-2
E number E220 (preservatives)
Gmelin Reference 1443
KEGG
MeSH {{{value}}}
PubChem {{{value}}}
RTECS number WS4550000
UNII
UN number 1079, 2037
SMILES {{{value}}}
Properties
SO
2
Molar mass 64.066 g mol−1
Appearance Colorless gas
Odor Pungent; similar to a just-struck match[1]
Density 2.6288 kg m−3
Melting point −72 °C; −98 °F; 201 K
Boiling point −10 °C (14 °F; 263 K)
94 g/L[2]
forms sulfurous acid
Vapor pressure 237.2 kPa
Acidity (pKa) 1.81
Basicity (pKb) 12.19
−18.2·10−6 cm3/mol
Viscosity 0.403 cP (at 0 °C)
Structure
C2v
Digonal
Dihedral
1.62 D
Thermochemistry
Std enthalpy of
formation
ΔfHo298
−296.81 kJ mol−1
Standard molar
entropy
So298
248.223 J K−1 mol−1
Hazards
NFPA 704

NFPA 704.svg

0
3
0
 
U.S. Permissible
exposure limit (PEL)
TWA 5 ppm (13 mg/m3)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Sulfur dioxide (also sulphur dioxide) is the chemical compound with the formula SO2. It is a gas. It smells like burnt matches. It also smells suffocating. Sulfur dioxide is produced by volcanoes and in various industrial processes. It is also used to protect wine from oxygen and bacteria. It can be produced by burning sulfur. It dissolves in water to produce sulfurous acid. It can be oxidized to trioxide, which is dissolved in sulfuric acid to make more sulfuric acid. It is used to make sulfites.

Sources[change | change source]

  1. Sulfur dioxide, U.S. National Library of Medicine
  2. Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.