Potassium sulfite

Potassium sulfite is the inorganic compound with the formula K2SO3. It is the salt of potassium cation and sulfite anion. It is a white solid that is highly soluble in water.

Potassium sulfite
Names
IUPAC name
Potassium sulfite
Other names
E225
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.279
UNII
  • InChI=1S/2K.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2 ☒N
    Key: BHZRJJOHZFYXTO-UHFFFAOYSA-L ☒N
  • InChI=1/2K.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
    Key: BHZRJJOHZFYXTO-NUQVWONBAU
  • [O-]S(=O)[O-].[K+].[K+]
Properties
K2SO3
Molar mass 158.26 g/mol
Appearance White solid
Soluble
Acidity (pKa) 8
−64.0·10−6 cm3/mol
Hazards
Flash point Non-flammable
Related compounds
Other anions
 Potassium sulfate
Potassium selenite
Other cations
 Sodium sulfite
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

Use

Potassium sulfite is widely used for preserving food and beverages.

Production and reactions
Main article: Sulfite § Reactions

Potassium sulfite is produced by the thermal decomposition of potassium metabisulfite at 190°C:[1]

K2S2O5 → K2SO3 + SO2
See also: Wellman–Lord process

References
  1. Johnstone, H. F. (1946). "Sulfites and Pyrosulfites of the Alkali Metals". Inorganic Syntheses. 2: 162–167. doi:10.1002/9780470132333.ch49. ISBN 9780470132333.


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