Names
Preferred IUPAC name: Propanoic acid
Other names
Propionic acid
Ethanecarboxylic acid
Identifiers
CAS Number: 79-09-4
JSmol: Interactive image
ChEBI: CHEBI:30768
ChEMBL: ChEMBL14021
ChemSpider: 1005
DrugBank: DB03766
ECHA InfoCard: 100.001.070
EC Number: 201-176-3
E number: (preservatives)
IUPHAR/BPS: 1062
PubChem: 1032
RTECS number: UE5950000
Properties
Chemical formula: C3H6O2
Molar mass: 74.08 g·mol
Appearance: Colorless, oily liquid
Odor: Pungent, rancid, unpleasant
Density: 0.98797 g/cm3
Melting point: −20.5 °C (−4.9 °F; 252.7 K)
Boiling point: 141.15 °C (286.07 °F; 414.30 K)
Sublimation
conditions: H
Solubility in water: 8.19 g/g (−28.3 °C)
34.97 g/g (−23.9 °C)
Miscible (≥ −19.3 °C)
Solubility: EtOH
log : 0.33
Vapor pressure: 0.32 kPa (20 °C)
0.47 kPa (25 °C)
9.62 kPa (100 °C)
Henry’s law
constant: 4.45·10 L·atm/mol−4
K: 4.88
Magnetic susceptibility: -43.50·10 cm/mol−63
Thermal conductivity: 1.44·10 W/m·K
Refractive index: 1.3843
Viscosity: P
Structure
Crystal structure: Monoclinic
Space group: P2/c1
Lattice constant: = 4.04 Å, = 9.06 Å, = 11 Å
Dipole moment: D
Thermochemistry
Specific
heat capacity: 152.8 J/mol·K
Std molar
entropy: 191 J/mol·K
Std enthalpy of
formation: −510.8 kJ/mol
Std enthalpy of
combustion: 1527.3 kJ/mol
Hazards
hazards: Corrosive
GHS pictograms:
GHS signal word: Danger
GHS hazard statements: H314
GHS precautionary statements: P280 P305+351+338 P310
NFPA 704:
Flash point: 54 °C (129 °F; 327 K)
Autoignition
temperature: 512 °C (954 °F; 785 K)
LD
median dose: 1370 mg/kg (mouse, oral)
NIOSH
PEL: none
REL: TWA 10 ppm (30 mg/m) ST 15 ppm (45 mg/m)33
IDLH: N.D.
Related compounds
anions: Propanoate
Carboxylic acids: Acetic acid
Related compounds: 1-Propanol
Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).Except where otherwise noted, data are given for materials in their(at 25 °C [77 °F], 100 kPa).
Infobox references
