Potassium acetate

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Potassium acetate
Skeletal formula of potassium acetate
Names
Preferred IUPAC name
Potassium acetate
Other names
Potassium ethanoate, E261
Identifiers
3D model (
JSmol
)
ChEMBL
ChemSpider
ECHA InfoCard
100.004.385 Edit this at Wikidata
E number E261 (preservatives)
UNII
  • InChI=1S/C2H4O2.K/c1-2(3)4;/h1H3,(H,3,4);/q;+1/p-1 ☒N
    Key: SCVFZCLFOSHCOH-UHFFFAOYSA-M ☒N
  • InChI=1/C2H4O2.K/c1-2(3)4;/h1H3,(H,3,4);/q;+1/p-1
    Key: SCVFZCLFOSHCOH-REWHXWOFAA
  • CC(=O)[O-].[K+]
Properties
C2H3KO2
Molar mass 98.142 g·mol−1
Appearance White
deliquescent
crystalline powder
Density 1.8 g/cm3 (20 °C)[1]
1.57 g/cm3 (25 °C)
Melting point 292 °C (558 °F; 565 K)
Boiling point Decomposes
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)[2]
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)[1]
Solubility in ethanol 16.3 g/100 g[1]
Solubility in sulfur dioxide 0.06 g/kg (0 °C)[1]
Acidity (pKa) 4.76
Structure
Monoclinic
Thermochemistry
109.38 J/mol·K[3]
150.82 J/mol·K[3]
Std enthalpy of
formation
fH298)
−722.6 kJ/mol[1]
Pharmacology
B05XA17 (WHO)
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
1
0
Lethal dose or concentration (LD, LC):
3250 mg/kg (oral, rat)[4]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Potassium acetate (also called potassium ethanoate), (CH3COOK) is the potassium salt of acetic acid. It is a hygroscopic solid at room temperature.

Preparation

It can be prepared by treating a potassium-containing base such as potassium hydroxide or potassium carbonate with acetic acid:

CH3COOH + KOH → CH3COOK + H2O

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.[2]

Applications

Deicing

Potassium acetate (as a substitute for

corrosive:[5] for this reason, it is preferred for airport runways although it is more expensive.[6]

Fire extinguishing

Potassium acetate is the extinguishing agent used in Class K fire extinguishers because of its ability to cool and form a crust over burning oils.

Food additive

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;[7] it is also approved for usage in the USA,[8] Australia, and New Zealand.[9] 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.

Medicine and biochemistry

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.

In molecular biology, potassium acetate is used to precipitate dodecyl sulfate (DS) and DS-bound proteins to extract ethanol from DNA.

Potassium acetate is used in mixtures applied for tissue preservation, fixation, and

Lenin's corpse.[11]

Use in executions

Potassium acetate was incorrectly used in place of

Charles Frederick Warner was executed on January 15, 2015 with potassium acetate; this was not public knowledge until the scheduled execution of Richard Glossip was called off. [13] In August 2017, the U.S. state of Florida executed Mark James Asay using a combination of etomidate, rocuronium bromide, and potassium acetate.[14] The drug was also used in the February 2023 execution of Donald Dillbeck, once again in combination with etomidate and rocuronium bromide. [15]

Industry

Potassium acetate is used as a catalyst in the production of polyurethanes.[16]

Historical

It is used as a

organometallic
compound ever produced.

References

  1. ^ a b c d e "Potassium acetate".
  2. ^ a b Seidell, Atherton; Linke, William F. (1952). Solubilities of Inorganic and Organic Compounds. Van Nostrand.
  3. ^ a b Acetic acid, potassium salt in Linstrom, Peter J.; Mallard, William G. (eds.); NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg (MD) (retrieved 2014-05-18)
  4. ^ https://chem.nlm.nih.gov/chemidplus/rn/127-08-2[dead link]
  5. .
  6. .
  7. ^ UK Food Standards Agency: "Current EU approved additives and their E Numbers". Retrieved 2011-10-27.
  8. ^ US Food and Drug Administration: "Listing of Food Additives Status Part II". Food and Drug Administration. Retrieved 2011-10-27.
  9. ^ Australia New Zealand Food Standards Code"Standard 1.2.4 - Labelling of ingredients". Retrieved 2011-10-27.
  10. ^ Dale Ulmer (1994). "Fixation. The Key to Good Tissue Preservation" (PDF). Journal of the International Society for Plastination. 8 (1): 7–10. Archived from the original (PDF) on 2011-05-16. Retrieved 2017-09-08.
  11. ^ Andrew Nagorski (2007). The Greatest Battle. Simon and Schuster. p. 53.
  12. ^ "Oklahoma used wrong drug in Charles Warner's execution, autopsy report says".
  13. ^ Eyder Peralta. "Oklahoma Used The Wrong Drug To Execute Charles Warner". NPR.
  14. ^ Jason Dearon. "Florida executes convicted killer Mark Asay using new drug". Sun Sentinel.
  15. ^ Kathryn Varn. "Convicted murderer Donald Dillbeck has been executed. Here's the latest". Tallahassee Democrat.
  16. .
  17. .

External links