ABSTRACT

The electric conductivities of aqueous solutions of sodium salts of benzoic acid, m-salicylic acid, and p-salicylic acid were measured in the temperature range from T = (278.15 to 313.15) K and in the concentration range c = ( 2*10 4 to 5*10 3) mol*dm 3. The data were analyzed with Barthel's low-concentration chemical model yielding the limiting molar conductivity, ?8 (T), and the association constant, KA(T). Using the known data of the limiting conductivities of sodium ion the limiting conductivities of the anions were evaluated, and their hydrodynamic radii in water were estimated. From ?8(T) the Eyring activation enthalpy of charge transport was determined and found to be higher than the corresponding value for viscous flow of water. Practically the total dissociation of the investigated salts in water is evident, and considerable differences in the anion mobilities are observed. They are discussed in terms of diffusivity and permeability of related acids at different carrier systems.

Compounds

#	Formula	Name
1	C8H7NaO3	sodium 2-hydroxy-3-methylbenzoate
2	C8H7NaO3	sodium 2-hydroxy-4-methylbenzoate
3	C7H5NaO2	sodium benzoate
4	H2O	water

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	4 1	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 1; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Vibrating tube method	2
POMD	4 1	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	88
POMD	2 4	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Vibrating tube method	2
POMD	2 4	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	72
POMD	3 4	Mass density, kg/m3 ; Liquid	Molality, mol/kg - 3; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Vibrating tube method	2
POMD	3 4	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	88

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Sodium Salts of Benzoic, m-Salicylic, and p-Salicylic Acid: A Conductivity Study of Diluted Aqueous Solutions

Bester-Rogac, M.[Marija]

ABSTRACT