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Potassium sulfite
Potassium sulfite.png
IUPAC name
Other names E225
CAS number 10117-38-1 Yes check.svgY
PubChem 24958
Molecular formula K2SO3
Molar mass 158.26 g/mol
EU Index Not listed
Flash point Non-flammable
Related compounds
Other anions Potassium sulfate
Potassium selenite
Other cations Sodium sulfite
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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.

Simple English

How the atoms in potassium sulfite are put together

Potassium sulfite is a chemical compound. Its chemical formula is K2SO3. It contains potassium and sulfite ions.



It is a white crystalline solid. It is a reducing agent. It can react with oxidizing agents to make potassium sulfate.


It is made by reacting sulfur dioxide with potassium hydroxide.

2 KOH + SO2 → K2SO3 + H2O


It is used to preserve food. Sulfites can cause allergies in some people, though.

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