Potassium Bisulphate

Potassium bisulfate is the potassium salt of bisulfate anion, with the molecular formula KHSO₄. This compound is commonly used in the conversion of tartrates to bitartrates in wine. Potassium bisulfate is also used as a disintegrating agent in analytical chemistry.

A solution of potassium bisulfate behaves as if the two related compounds (K₂SO₄ and H₂SO₄) were side by side uncombined. Adding ethanol to a solution of potassium bisulfate precipitates out sulfate.

Mercallite, the mineralogical form of potassium bisulfate, occurs very rarely. Misenite is the other, more complex, potassium hydrogen sulfate.