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Potassium bisulfate
Potassium bisulfate.png
IUPAC name
Other names Potassium acid sulfate
Identifiers
CAS number 7646-93-7 Yes check.svgY
PubChem 516920
EC number 231-594-1
UN number 2509
RTECS number TS7200000
Properties
Molecular formula KHSO4
Molar mass 136.169 g/mol
Density 2.245 g/cm3
Melting point

197 °C

Boiling point

Dec. > 300 °C

Solubility in water 490 g/L
Hazards
MSDS External MSDS
EU Index 016-056-00-4
EU classification Corrosive (C)
R-phrases R34, R37
S-phrases (S1/2), S26, S36/37/39, S45
Related compounds
Related compounds Sodium bisulfate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

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.

See also

References

  • Merck Index of Chemicals and Drugs, 14th ed.
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