ABSTRACT

The dilution enthalpies of glycine, l-alanine and l-serine in aqueous potassium chloride solutions of various molalities have been determined using LKB-2277 flow microcalorimetry at 298.15 K. The homogeneous enthalpic interaction coefficients over the whole range of aqueous potassium chloride solutions investigated have been calculated according to the excess enthalpy concept. It is found that pairwise enthalpic interaction coefficients h2 of glycine and l-serine are all negative and become less negative with increasing of the molalities of potassium chloride, while pairwise enthalpic interaction coefficients h2 of l-alanine are positive on which the influence of potassium chloride is not obvious. The results are interpreted from the point of view of solute solute interactions involved by solvent effects.

Compounds

#	Formula	Name
1	C2H5NO2	2-aminoacetic acid
2	C3H7NO2	(S)-2-aminopropanoic acid
3	C3H7NO3	L-serine
4	H2O	water
5	ClK	potassium 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 4	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	2 4	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:	12
POMD	3 4	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:	12
POMD	1 5 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 5; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Flow calorimetry	90
POMD	2 5 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 5; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Flow calorimetry	90
POMD	3 5 4	Molar enthalpy of dilution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 5; Liquid Initial molality of solute, mol/kg; Liquid Final molality of solute, mol/kg; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Flow calorimetry	90

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpies of dilution of glycine, l-alanine and l-serine in aqueous potassium chloride solutions

Wang, X.[Xu], Xu, L.[Li], Lin, R.[Ruisen], Sun, D.[Dezhi]

ABSTRACT