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Names | |||
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Preferred IUPAC name
Potassium acetate | |||
Other names
Potassium ethanoate, E261
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Identifiers | |||
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 | 98.142 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 | |||
Heat capacity (C)
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109.38 J/mol·K[3] | ||
Std molar
entropy (S⦵298) |
150.82 J/mol·K[3] | ||
Std enthalpy of
formation (ΔfH⦵298) |
−722.6 kJ/mol[1] | ||
Pharmacology | |||
B05XA17 (WHO) | |||
Hazards | |||
NFPA 704 (fire diamond) | |||
Lethal dose or concentration (LD, LC): | |||
LD50 (median dose)
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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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Potassium acetate (also called potassium ethanoate), (CH3COOK) is the potassium salt of acetic acid. It is a hygroscopic solid at room temperature.