Potassium sulfite

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

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

Preparation
It is made by reacting sulfur dioxide with potassium hydroxide.
2 KOH + SO2 → K2SO3 + H2O

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

Related pages
Sodium sulfite
Potassium sulfate

Category:Potassium compounds
Category:Sulfur compounds