Potassium acetate
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| Names | |||
|---|---|---|---|
| Preferred IUPAC name
Potassium acetate | |||
| Other names
Potassium ethanoate, E261 | |||
| Identifiers | |||
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3D model (JSmol) |
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| ChEMBL | |||
| ChemSpider | |||
| ECHA InfoCard | 100.004.385 | ||
| E number | E261 (preservatives) | ||
PubChem CID |
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| UNII | |||
CompTox Dashboard (EPA) |
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| 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 ΔfH |
−722.6 kJ/mol[1] | ||
| Standard molar entropy S |
150.82 J/mol·K[3] | ||
| Specific heat capacity, C | 109.38 J/mol·K[3] | ||
| Pharmacology | |||
| B05XA17 (WHO) | |||
| Hazards | |||
| NFPA 704 (fire diamond) | |||
| Lethal dose or concentration (LD, LC): | |||
LD50 (median dose) |
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). | |||
 verify (what is  ?) | |||
| 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
[change | change source]- 1 2 3 4 5 "Potassium acetate".
- ↑ Seidell, Atherton; Linke, William F. (1952). Solubilities of Inorganic and Organic Compounds. Van Nostrand.
- 1 2 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)
- ↑ nih.gov
