Potassium bisulfate (potassium bisulphate) is an inorganic compound with the chemical formula KHSO4 and is the potassium acid salt of sulfuric acid. It is a white, water-soluble solid.

Properties

Chemical formula : KHSO4

Molar mass : 136.169 g/mol

Appearance : colorless solid

Odor : odorless

Density : 2.245 g/cm3

Melting point : 197 °C (387 °F; 470 K)

Boiling point : 300 °C (572 °F; 573 K) (decomposes to form potassium pyrosulfate and water)

Solubility in water : 36.6 g/100 mL (0 °C); 49 g/100 mL (20 °C); 121.6 g/100 mL (100 °C)

Solubility : soluble in acetone, ethanol.

Other name : Potassium acid sulfate

Uses

Potassium bisulfate is commonly used to prepare potassium bitartrate for winemaking. Potassium bisulfate is also used as a disintegrating agent in analytical chemistry or as a precursor to prepare potassium persulfate, a powerful oxidizing agent.