Sodium benzoate was synthesized by the method of liquid phase synthesis, in which benzoic acid and anhydrous sodium carbonate were chosen as the reactants. The structure and composition of the compound were characterized by FTIR, chemical analysis, elemental analysis and X-ray powder diffraction techniques. Low temperature heat capacities of the compound were measured by a precision automated adiabatic calorimeter over the temperature range from 78 to 400 K. A polynomial equation of the heat capacities as a function of the temperature was fitted by least square method. The smoothed heat capacities and the thermodynamic functions of the compound relative to 298.15K have been calculated based on the equation. In accordance with Hess law, the standard molar enthalpy of formation of the title compound C6H5COONa (s) was determined to be fH.m[C6H5COONa, s] = .(642.56 } 0.64) kJmol.1 by using an isoperibol solution-reaction calorimeter.
Compounds
#
Formula
Name
1
Na
sodium
2
C
graphite
3
H2
hydrogen
4
O2
oxygen
5
C2H4O2
acetic acid
6
C7H6O2
benzoic acid
7
C2H3NaO2
sodium ethanoate
8
C7H5NaO2
sodium benzoate
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
8
Molar heat capacity at constant pressure, J/K/mol ; Crystal