2% (wt.), solvent - water Density (g/cm3) = 1.0048 (18°) 10% (wt.), solvent - water Density (g/cm3) = 1.028 (18°) 20% (wt.), solvent - water Density (g/cm3) = 1.0602 (18°) 30% (wt.), solvent - water Density (g/cm3) = 1.0921 (18°) 38% (wt.), solvent - water Density (g/cm3) = 1.1173 (18°)
Numerical data:
Year of discovery: 1867
Density:
0.9151 (-80°C, g/cm3) 0.8153 (-20°C, g/cm3)
Vapour pressure (Torr):
20 (-79.6°C)
Electrode potential:
HCOO- + 2H2O + 2e- → CH2O + 3OH-, E = -1.07 V (water, 25°C)
Dissociation:
pKa (1) = 13.27 (25°C, water)
Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):
-115.9 (g)
Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):
-110 (g)
Standard molar entropy S0 (298.15 K, J/(mol·K)):
218.66 (g)
Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):
35.35 (g)
Enthalpy (heat) of vaporization ΔvapH (kJ/mol):
23.3
Heat of combustion (kJ/mol):
561.1
References:
CRC Handbook of Chemistry and Physics. - 95ed. - CRC Press, 2014. - pp. 3-278
Альберт А., Сержент Е. Константы ионизации кислот и оснований. - М.-Л.: Химия, 1964. - pp. 123-124 [Russian]
Вредные вещества в промышленности: Справочник для химиков, инженеров и врачей. - 7-е изд., Т.1. - Л.: Химия, 1976. - pp. 505-509 [Russian]
Некрасов Б.В. Основы общей химии. - Т.1. - М.: Химия, 1973. - pp. 560 [Russian]