Potassium tartrate

Potassium tartrate
IUPAC name
Dipotassium 2,3-dihydroxybutanedioate
Other names
Dipotassium tartrate; Argol; E336
921-53-9 (L) N
3D model (Jmol) Interactive image
ChemSpider 2697916 YesY
ECHA InfoCard 100.011.880
E number E336 (antioxidants, ...)
PubChem 8984
Molar mass 226.268 g/mol
Appearance colorless, slightly opaque crystals
Density 1.984 g/cm3
Solubility insoluble in alcohol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Potassium tartrate, dipotassium tartrate or argol has formula K2C4H4O6. It is the potassium salt of tartaric acid. It is often confused with potassium bitartrate, also known as cream of tartar. As a food additive, it shares the E number E336 with potassium bitartrate.


Potassium tartrate is produced by the reaction of tartaric acid with potassium sodium tartrate (rochelle salt), and potassium sulfate, followed by filtration, purification, precipitation and drying.

Other compounds

Tartar emetic is produced when potassium tartrate is heated with antimony trioxide. Tartar emetic causes intense nausea, prostration and vomiting by irritating the gastrointestinal mucosa.

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