ABSTRACT

The present work was undertaken to study volumetric and acoustic properties for diluted solutions of tetramethylurea in pure water and for urea, n-propylurea, n-butylurea and tetramethylurea in 0.5 or 1 mol dm 3 aqueous solutions of sodium chloride. This paper presents measured values of densities and sound velocities at T = (288.15, 298.15 and 308.15) K. From these data the apparent molar volumes, VU, adiabatic compressibilities, jS, and apparent molar adiabatic compressions, KS,U, were obtained. The values of apparent molar volumes for infinite dilution and limited apparent adiabatic compressions were calculated from extrapolation of the concentration dependence. Further, the corresponding transfer data as well as hydration number of urea and its derivatives in the studied systems were estimated. The obtained parameters are discussed in terms of various solute-solvent and solute-cosolute interactions.

Compounds

#	Formula	Name
1	ClNa	sodium chloride
2	CH4N2O	urea
3	C4H10N2O	N-propylurea
4	C5H12N2O	N-butylurea
5	C5H12N2O	tetramethylurea
6	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	5	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	5
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	5
POMD	6	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	3
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	3
POMD	2 1 6	Speed of sound, m/s ; Liquid	Solvent: Ratio of amount of component to mass of solvent, mol/kg - 1; Liquid Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	45
POMD	2 1 6	Mass density, kg/m3 ; Liquid	Solvent: Ratio of amount of component to mass of solvent, mol/kg - 1; Liquid Temperature, K; Liquid Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	45
POMD	3 1 6	Speed of sound, m/s ; Liquid	Solvent: Ratio of amount of component to mass of solvent, mol/kg - 1; Liquid Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	45
POMD	3 1 6	Mass density, kg/m3 ; Liquid	Solvent: Ratio of amount of component to mass of solvent, mol/kg - 1; Liquid Temperature, K; Liquid Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	45
POMD	4 1 6	Speed of sound, m/s ; Liquid	Solvent: Ratio of amount of component to mass of solvent, mol/kg - 1; Liquid Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	45
POMD	4 1 6	Mass density, kg/m3 ; Liquid	Solvent: Ratio of amount of component to mass of solvent, mol/kg - 1; Liquid Temperature, K; Liquid Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	45
POMD	5 1 6	Speed of sound, m/s ; Liquid	Solvent: Ratio of amount of component to mass of solvent, mol/kg - 1; Liquid Temperature, K; Liquid Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	72
POMD	5 1 6	Mass density, kg/m3 ; Liquid	Solvent: Ratio of amount of component to mass of solvent, mol/kg - 1; Liquid Temperature, K; Liquid Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	72
POMD	1 6	Speed of sound, m/s ; Liquid	Ratio of amount of solute to mass of solution, mol/kg - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	9
POMD	1 6	Mass density, kg/m3 ; Liquid	Ratio of amount of solute to mass of solution, mol/kg - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	12
POMD	5 6	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	21
POMD	5 6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	21

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Effect of temperature and ionic strength on volumetric and acoustic properties of solutions of urea alkyl derivatives in aqueous NaCl

Krakowiak, J.[Joanna], Wawer, J.[Jaroslaw]

ABSTRACT