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.