Potassium hydrogen sulfite

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Structural formula
Potassium ion Bisulfite-OH-tautomer-2D-pyramidal.png
Surname Potassium hydrogen sulfite
other names

Potassium bisulfite

Molecular formula KHSO 3
Brief description

white solid

External identifiers / databases
CAS number 7773-03-7
EC number 231-870-1
ECHA InfoCard 100,028,973
PubChem 23663620
ChemSpider 22889
Wikidata Q412524
Molar mass 120.16 g mol −1
Physical state


Melting point

190 ° C (decomposition)

  • soluble in water (490 g l −1 at 20 ° C)
  • practically insoluble in ethanol
safety instructions
GHS labeling of hazardous substances
07 - Warning


H and P phrases H: 319-335
EUH: 031
P: ?
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Potassium hydrogen sulfite is a potassium salt of sulphurous acid and has the empirical formula KHSO 3 .

Extraction and presentation

Potassium hydrogen sulfite can be obtained by reacting sulfur dioxide with a potassium carbonate solution.


Potassium hydrogen sulfite is z. B. Wine added as an antioxidant and preservative . The permissible concentration is based on the statutory maximum quantities of sulfur dioxide. In addition, potassium hydrogen sulfite is used in a variety of other foods, such as starch, sago, pearl barley, dried potato products, vegetables, dried fruits, nuts, meat and fish.

It is approved in the EU as a food additive with the number E 228 .

The compound gives off sulfur dioxide.

Side effects

Excessive consumption of potassium hydrogen sulfite can lead to headaches , migraines and nausea . In addition, B vitamins and folic acid are destroyed. Food with this addition must have the number E228 in the list of ingredients .

Individual evidence

  1. a b c d e William M. Haynes: CRC Handbook of Chemistry and Physics, 97th Edition . CRC Press, 2016, ISBN 978-1-4987-5429-3 , pp. 99 ( limited preview in Google Book search).
  2. Template: CL Inventory / not harmonized There is not yet a harmonized classification for this substance . A labeling of potassium hydrogen sulphite in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), retrieved on March 4, 2020, is reproduced from a self-classification by the distributor .
  3. ^ Entry on Potassium Hydrogen Sulphite in the Hazardous Substances Data Bank , accessed April 16, 2018.
  4. George A. Burdock: Encyclopedia of Food and Color Additives . CRC Press, 1997, ISBN 978-0-8493-9412-6 , pp. 3000 ( limited preview in Google Book Search).

See also

Web links