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

Enthalpic Interaction Coefficients of N-(N- Glycylglycyl)glycine in Aqueous Sodium Chloride and Potassium Chloride Solutions at 298.15 K

Liu, M.[Min], Wang, L.[Lili], Li, G.[Guangqian], Sun, D.[Dezhi], Zhu, L.[Lanying], Di, Y.[Youying]
J. Chem. Eng. Data 2010, 55, 5, 1842-1846
ABSTRACT
The enthalpies of dilution have been measured for N-(N-glycylglycyl)glycine in aqueous sodium chloride and potassium chloride solutions at 298.15 K using a mixing-flow microcalorimeter. The enthalpic interaction coefficients h2, h3, and h4 in the studied aqueous solutions have been calculated according to the McMillan-Mayer model. The results show that the enthalpic pairwise interaction coefficients h2 of N-(N-glycylglycyl)glycine in both electrolyte solutions are negative and become less negative as the molality of sodium chloride or potassium chloride increases. The value of h2 in aqueous sodium chloride solutions is less than that in aqueous potassium chloride solutions of the same molality. The effects of the two salts on h2 are discussed from the point of view of electrostatic and structural interactions.
Compounds
# Formula Name
1 ClNa sodium chloride
2 ClK potassium chloride
3 H2O water
4 C6H11N3O4 glycylglycylglycine
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
  • 4
  • 1
  • 3
  • Molar enthalpy of dilution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 1; 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
  • 4
  • 2
  • 3
  • Molar enthalpy of dilution, kJ/mol ; Liquid
  • Solvent: Molality, mol/kg - 2; Liquid
  • Initial molality of solute, mol/kg; Liquid
  • Final molality of solute, mol/kg; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Flow calorimetry
  • 72