Potassium bisulfite (or potassium hydrogen sulfite) is a chemical mixture with the approximately correctly mentioned formula chemical formula KHSO3.

Potassium bisulfite in fact is not an actual compound,[1] but a mixture of salts that dissolve in water to give solutions composed of potassium ions and bisulfite ions.

It is a white solid with an odor of sulfur dioxide.

[2] Potassium bisulfite is used as a sterilising agent in the production of alcoholic beverages.

[4] It is made by the reaction of sulfur dioxide and potassium carbonate.