Potassium sulfite

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Potassium sulfite
Potassium sulfite.png
IUPAC name
Potassium sulfite
Other names
10117-38-1 YesY
ChemSpider 23332 N
Jmol 3D model Interactive image
PubChem 24958
Molar mass 158.26 g/mol
Appearance white solid
Acidity (pKa) 8
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).
N verify (what is YesYN ?)
Infobox references

Potassium sulfite (K2SO3) is a chemical compound which is the salt of potassium cation and sulfite anion. As a food additive it is used as a preservative under the E number E225 (INS number 225). It is approved for use in Australia and New Zealand[1] and is not approved in the EU.[2]


  1. ^ Australia New Zealand Food Standards Code"Standard 1.2.4 - Labelling of ingredients". Retrieved 2011-10-27. 
  2. ^ UK Food Standards Agency: "Current EU approved additives and their E Numbers". Retrieved 2011-10-27.