ABSTRACT

The enthalpies of dilution of acetamide and N,N-dimethylformamide (DMF) in pure water and aqueous sodium chloride solutions have been determined using flow microcalorimetry at 298.15 K. The homogeneous enthalpic interaction coefficients (h2, h3, h4) in the range of sodium chloride molality, (0 to 0.6) mol * kg-1, have been calculated according to the McMillan-Mayer theory. It is found that the enthalpic pairwise interaction coefficients h2 of acetamide and DMF are all positive in aqueous sodium chloride solution and become more positive with an increase in the molality of sodium chloride. The value of h2 of acetamide is less than that of DMF in pure water and an aqueous solution of the same sodium chloride molality. The results are discussed in terms of the solute-solute and solute-solvent interactions.

Compounds

#	Formula	Name
1	C2H5NO	ethanamide
2	H2O	water
3	C3H7NO	dimethylformamide
4	ClNa	sodium chloride

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	1 2	Molar enthalpy of dilution, kJ/mol ; Liquid	Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Flow calorimetry	12
POMD	3 2	Molar enthalpy of dilution, kJ/mol ; Liquid	Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Flow calorimetry	12
POMD	1 4 2	Molar enthalpy of dilution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 4; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Flow calorimetry	84
POMD	3 4 2	Molar enthalpy of dilution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 4; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Flow calorimetry	84

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

Enthalpies of Dilution of Acetamide and N,N-Dimethylformamide in Aqueous Sodium Chloride Solutions at 298.15 K

Liu, M.[Min], Zhu, L.[Lanying], Li, B.[Bin], Zhao, Q.[Qiang], Sun, D.[Dezhi]

ABSTRACT