The data in this section refers to the pure acid. Values for the commercial product may deviate slightly
from these figures.
Molecular mass 60.053
Density at 20掳C 1.049 kg/litre
Melting point 16.66掳C
Latent heat of fusion at 195.5 kJ/kg掳C
Boiling point at 1013 mbar 117.9掳C
Latent heat of vaporisation at 394.5 kJ/kg
Critical temperature 591.95 K
Critical pressure 5.786 MPa
Coefficient of expansion
at 20掳C 1.04 x 10-3 per 掳C
Mean from 0-100掳C 1.12 x 10-3 per 掳C
Specific heat capacity at 19.4掳C 2.043 J/g /K
(liquid, constant pressure)
Normal entropy S掳 ( liq, 25掳c) 159.8 Jmol/K
S掳 ( s, 25掳c ) 282.5 Jmol/K
Vapour pressure at 20掳C 15.7 mbar
Heat of formation (vapour) 432.25 kJ/mole
Flash point (closed cup) 43掳C
Autoignition temperature 463掳C
Flammable limits in air
lower 4.0% volume
upper 16.00% volume
Heat of combustion -786.6 KJ/mol
Dielectric constant (liquid) 6.170
Refractive index nD20 1.3719
Surface tension at 20掳C 27.6 mN/m
Viscosity at 20掳C 1.183 mPa.s
Dissociation constant at 25掳C 4.78 pKa
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