Potassium acetate

Potassium acetate (also known as potassium ethanoate) is a potassium salt of acetic acid. It is made when acetic acid reacts with basic potassium compounds like…

Potassium acetate
Potassium acetate
Skeletal formula of potassium acetate
Names
Preferred IUPAC name
Potassium acetate
Other names
Potassium ethanoate, E261
Identifiers
  • 127-08-2 checkY
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.004.385
E number E261 (preservatives)
UNII
  • CC(=O)[O-].[K+]
Properties
C2H3KO2
Molar mass 98.14 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
Std enthalpy of
formation ΔfHo298 		−722.6 kJ/mol[1]
Standard molar
entropy So298 		150.82 J/mol·K[3]
Specific heat capacity, C 109.38 J/mol·K[3]
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).
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Infobox references

Potassium acetate (also known as potassium ethanoate) is a potassium salt of acetic acid. It is made when acetic acid reacts with basic potassium compounds like potassium hydroxide, potassium carbonate, or potassium bicarbonate. The chemical formula is CH3COOK. It is an ionic compound made of potassium ions and acetate ions.

It can dissolve in water, methanol, ethanol or liquid ammonia, but not in ether or acetone, and slightly soluble in sulfur dioxide (0.06g/kg) at 0 °C (32 °F). It is used as a food additive to regulate the acidity of foods.

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 "Potassium acetate".
  2. ↑ Seidell, Atherton; Linke, William F. (1952). Solubilities of Inorganic and Organic Compounds. Van Nostrand.
  3. ↑ 3.0 3.1 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), http://webbook.nist.gov (retrieved 2014-05-18)
  4. ↑ nih.gov

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