ABSTRACT

Densities and sound velocities for solutions of potassium dihydrogen citrate (KH2Cit) and tripotassium citrate (K3Cit) in aqueous solutions of (0.00, 0.23, 0.47, and 0.72) mol * kg-1 of alanine have been determined experimentally at T ) (283.15, 288.15, 293.15, 298.15, 303.15, and 308.15) K at atmospheric pressure. From these experimental data, the apparent molar volume and isentropic compressibility values have been evaluated and fitted to a Redlich-Mayer-type equation. The results show positive transfer volumes at infinite dilution for electrolytes from water to aqueous alanine solutions, and these values increase with the concentration of alanine. The apparent molar isentropic compressibility of both KH2Cit and K3Cit in aqueous alanine solutions is negative, which implies that the water molecules around these salts are less compressible than the water molecules in the bulk solutions. It was found that the effect of alanine concentration on the apparent molar volume and isentropic compressibility of K3Cit is more than those of KH2Cit.

Compounds

#	Formula	Name
1	C3H7NO2	(S)-2-aminopropanoic acid
2	C6H7KO7	potassium dihydrogen citrate
3	H2O	water
4	C6H5K3O7	potassium citrate

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	3	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	6
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	1 2 3	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 1; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	300
POMD	1 2 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 1; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	300
POMD	1 4 3	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 1; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	306
POMD	1 4 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Solvent: Molality, mol/kg - 1; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	306
POMD	1 3	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	36
POMD	1 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	36
POMD	2 3	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	96
POMD	2 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	96

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

Volumetric Properties of Potassium Dihydrogen Citrate and Tripotassium Citrate in Water and in Aqueous Solutions of Alanine at T ) (283.15 to 308.15) K

Sadeghi, R.[Rahmat], Goodarzi, B.[Baharak]

ABSTRACT