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Potassium sulfite

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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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