|Preferred IUPAC name
Potassium salt, E261
3D model (JSmol)
|E number||E261 (preservatives)|
CompTox Dashboard (EPA)
|Molar mass||98.142 g·mol−1|
|Appearance||White deliquescent crystalline powder|
|Density||1.8 g/cm3 (20 °C)|
1.57 g/cm3 (25 °C)
|Melting point||292 °C (558 °F; 565 K)|
|216.7 g/100 mL (0.1 °C)|
233.8 g/100 mL (10 °C)
268.6 g/100 mL (25 °C)
320.8 g/100 mL (40 °C)
390.7 g/100 mL (96 °C)
|Solubility||Soluble in alcohol, liquid ammonia|
Insoluble in ether, acetone
|Solubility in methanol||24.24 g/100 g (15 °C)|
53.54 g/100 g (73.4 °C)
|Solubility in ethanol||16.3 g/100 g|
|Solubility in sulfur dioxide||0.06 g/kg (0 °C)|
Heat capacity (C)
Std enthalpy of
|NFPA 704 (fire diamond)|
|Lethal dose or concentration (LD, LC):|
LD50 (median dose)
|3250 mg/kg (oral, rat)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
(what is ?)
This sort of reaction is known as an acid-base neutralization reaction.
The sesquihydrate in water solution (CH3COOK·1½H2O) begins to form semihydrate at 41.3 °C.
Potassium acetate (as a substitute for calcium chloride or magnesium chloride) can be used as a deicer to remove ice or prevent its formation. It offers the advantage of being less aggressive on soils and much less corrosive: for this reason, it is preferred for airport runways although it is more expensive.
Potassium acetate is used in processed foods as a preservative and acidity regulator. In the European Union, it is labeled by the E number E261; it is also approved for usage in the USA, Australia, and New Zealand. Potassium hydrogen diacetate (CAS #4251-29-0 ) with formula KH(OOCCH3)2 is a related food additive with the same E number as potassium acetate.
In medicine, potassium acetate is used as part of electrolyte replacement protocols in the treatment of diabetic ketoacidosis because of its ability to break down to bicarbonate to help neutralize the acidotic state.
Potassium acetate is used in mixtures applied for tissue preservation, fixation, and mummification. Most museums today use aformaldehyde-based method recommended by Kaiserling in 1897 which contains potassium acetate. This process was used to soak Lenin's corpse.
Potassium acetate was almost incorrectly used in place of potassium chloride when putting a prisoner to death in Oklahoma in January 2015. In August 2017, the U.S. state of Florida executed Mark James Asay using a combination of etomidate, rocuronium bromide, and potassium acetate.
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