Potassium bisulfate

Chembox new
ImageFile = Potassium bisulfate.png ImageSize = 150px
IUPACName =
OtherNames = Potassium hydrogen sulfate; potassium acid sulfate
Section1 = Chembox Identifiers
CASNo = 7646-93-7
PubChem =
SMILES =
Section2 = Chembox Properties
Formula = KHSO₄
MolarMass = 136.17 g/mol
Appearance =
Density = 2.245 g/cm³
MeltingPt = 197 °C
BoilingPt = Dec. > 300 °C
Solubility = 490 g/L
Section3 = Chembox Hazards
MainHazards =
FlashPt =
Autoignition =
EUClass = Corrosive (C)
ExternalMSDS = [http://ptcl.chem.ox.ac.uk/MSDS/PO/potassium_bisulfate.html External MSDS]
RPhrases = R34 R36 R37 R38
SPhrases = S26 S36 S37 S39 S45

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.

ee also

*Potassium sulfate
*Sodium bisulfate
*Sulfuric acid
*Sulfate

References

*"Merck Index of Chemicals and Drugs", 14th ed.