Simplified skeletal formula
Full structural formula
Ball-and-stick model
Space-filling model
Names
Preferred IUPAC name
Other names
Propionic acid Ethanecarboxylic acid
Identifiers
3D model (JSmol )
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard
100.001.070
EC Number
E number
E280 (preservatives)
IUPHAR/BPS
RTECS number
InChI
SMILES
Properties
C 3 H 6 O 2
Molar mass
74.079 g·mol−1
Appearance
Colorless, oily liquid[ 1]
Odor
Pungent, rancid, unpleasant[ 1]
സാന്ദ്രത
0.98797 g/cm3 [ 2]
ദ്രവണാങ്കം
ക്വഥനാങ്കം
141.15 °C (286.07 °F; 414.30 K) [ 3]
Sublimation conditions
Sublimes at −48 °C Δsubl H o = 74 kJ/mol[ 4]
8.19 g/g (−28.3 °C) 34.97 g/g (−23.9 °C) Miscible (≥ −19.3 °C)[ 5]
Solubility
Miscible in EtOH , ether , CHCl3 [ 6]
log P
0.33[ 7]
ബാഷ്പമർദ്ദം
0.32 kPa (20 °C)[ 8] 0.47 kPa (25 °C)[ 7] 9.62 kPa (100 °C)[ 4]
Henry's law constant (k H )
4.45·10−4 L·atm/mol[ 7]
Acidity (pK a )
4.88[ 7]
-43.50·10−6 cm3 /mol
Thermal conductivity
1.44·105 W/m·K
1.3843[ 2]
വിസ്കോസിറ്റി
1.175 cP (15 °C)[ 2] 1.02 cP (25 °C) 0.668 cP (60 °C) 0.495 cP (90 °C)[ 7]
Structure
Monoclinic (−95 °C)[ 9]
Space group
P21 /c[ 9]
Lattice constant
a =
4.04
Å,
b =
9.06
Å,
c =
11
Å
[ 9] α = 90°, β = 91.25°, γ = 90°
Dipole moment
0.63 D (22 °C)[ 2]
Thermochemistry
152.8 J/mol·K[ 6] [ 4]
Std molar entropy (S ⦵ 298 )
191 J/mol·K[ 4]
Std enthalpy of formation (Δf H ⦵ 298 )
−510.8 kJ/mol[ 4]
Std enthalpy of combustion (Δc H ⦵ 298 )
1527.3 kJ/mol[ 2] [ 4]
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Corrosive
GHS labelling :
Pictograms
[ 10]
Signal word
Danger
Hazard statements
H314 [ 10]
Precautionary statements
P280 , P305+P351+P338 , P310 [ 10]
NFPA 704 (fire diamond)
Flash point
54 °C (129 °F; 327 K) [ 10]
Autoignition temperature
512 °C (954 °F; 785 K)
Lethal dose or concentration (LD, LC):
LD50 (median dose )
1370 mg/kg (mouse, oral)[ 6]
NIOSH (US health exposure limits):
PEL (Permissible)
none[ 1]
REL (Recommended)
TWA 10 ppm (30 mg/m3 ) ST 15 ppm (45 mg/m3 )[ 1]
IDLH (Immediate danger)
N.D.[ 1]
Related compounds
Other anions
Propanoate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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