ABSTRACT

Enthalpies of solution of glycine, l-alanine and l-serine in water and aqueous solutions of NaNO3 and NaClO4 have been determined at T = 298.15K with a calorimeter. Enthalpies of transfer (delta(tr)H) from water to aqueous solutions of salts were derived and interpreted in terms of electrostatic interaction and structural interaction. delta(tr)H decreases with increasing salt concentration in the composition range studied. The transfer enthalpies of amino acids from water to NaNO3 solution and low concentration NaClO4 solution vary in the sequence l-serine < glycine < l-alanine while glycine < l-serine < l-alanine in NaClO4 solution above 2 mol kg-1. The difference may be due to ion association at high concentration, weakening the interaction with l-serine more than with glycine.

Compounds

#	Formula	Name
1	NNaO3	sodium nitrate
2	ClNaO4	sodium perchlorate
3	C2H5NO2	2-aminoacetic acid
4	C3H7NO2	(S)-2-aminopropanoic acid
5	H2O	water
6	C3H7NO3	L-serine

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 5	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Molality, mol/kg - 3; Liquid		Liquid	CALVET:solid	1
POMD	4 5	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Molality, mol/kg - 4; Liquid		Liquid	CALVET:solid	1
POMD	6 5	Molar enthalpy of solution, kJ/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Molality, mol/kg - 6; Liquid		Liquid	CALVET:solid	1
POMD	3 1 5	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 1; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Molality, mol/kg - 3; Liquid	Liquid	CALVET:solid	9
POMD	4 1 5	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 1; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Molality, mol/kg - 4; Liquid	Liquid	CALVET:solid	9
POMD	6 1 5	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 1; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Molality, mol/kg - 6; Liquid	Liquid	CALVET:solid	9
POMD	3 2 5	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Molality, mol/kg - 3; Liquid	Liquid	CALVET:solid	9
POMD	4 2 5	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Molality, mol/kg - 4; Liquid	Liquid	CALVET:solid	9
POMD	6 2 5	Molar enthalpy of solution, kJ/mol ; Liquid	Solvent: Molality, mol/kg - 2; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid Molality, mol/kg - 6; Liquid	Liquid	CALVET:solid	9

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Enthalpies of transfer of amino acids from water to aqueous solutions of sodium nitrate and sodium perchlorate at T = 298.15K

Liu, C.[Chunli], Lin, R.[Ruisen]

ABSTRACT