Potassium sulfite
Appearance
![](http://chped.net/https/upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Potassium_sulfite.png/220px-Potassium_sulfite.png)
Potassium sulfite is a chemical compound. Its chemical formula is K2SO3. It contains potassium and sulfite ions.
Properties[change | change source]
It is a white crystalline solid. It is a reducing agent. It can react with oxidizing agents to make potassium sulfate.
Preparation[change | change source]
It is made by reacting sulfur dioxide with potassium hydroxide.
- 2 KOH + SO2 → K2SO3 + H2O
Uses[change | change source]
It is used to preserve food. Sulfites can cause allergies in some people, though.