Zusammenfassung
Vapor pressure osmometry was applied to the system aminomethanamidine hydrochloride (guanidinium hydrochloride, GndmCl) + (S)-aminobutanedioic acid hemimagnesium salt (magnesium l-aspartate, Mg-(L-Asp)(2)) + water for varying molalities of GndmCl and Mg-(L-Asp)(2) (m(Mg-(Asp)2) = 0.1, 0.2, and 0.3 mol/kg and m(GndmCl) = 0.11.2 mol/kg) at T = 298.15 and 310.15 K. From vapor pressure osmometry, ...
Zusammenfassung
Vapor pressure osmometry was applied to the system aminomethanamidine hydrochloride (guanidinium hydrochloride, GndmCl) + (S)-aminobutanedioic acid hemimagnesium salt (magnesium l-aspartate, Mg-(L-Asp)(2)) + water for varying molalities of GndmCl and Mg-(L-Asp)(2) (m(Mg-(Asp)2) = 0.1, 0.2, and 0.3 mol/kg and m(GndmCl) = 0.11.2 mol/kg) at T = 298.15 and 310.15 K. From vapor pressure osmometry, activities of water, activity coefficients of water, and the corresponding osmotic coefficients of the mixtures Mg-(L-Asp)(2) + water and Mg-(L-Asp)(2) + GndmCl + water have been calculated, both being directly related to the chemical potentials of the different species and therefore to their Gibbs energy. Electrolyte perturbed-chain statistical associating fluid theory (ePC-SAFT) accounting for Coulomb and short-range (hard chain, dispersion, association) interactions was used to model the own experimental data of binary Mg-(L-Asp)(2) + water and ternary GndmCl + Mg-(L-Asp)(2) + water solutions. ePC-SAFT was further applied to model osmotic coefficients of NaGlu + KCl + water, NaGlu + NaCl + water, NaAsp + NaCl + water, NaAsp + KCl + water, aminoethanoic acid + NaNO3 + water, and aminoethanoic acid + NaSCN + water as well as thermodynamic properties of these solutions such as fugacity coefficients and activity coefficients of the mixture components. Without fitting any parameters to data of the ternary salt + aminoethanoic acid + water system, osmotic coefficients, phi, and activity coefficients of water, gamma(1), and aminoethanoic acid have been predicted, and phi and gamma(1) were in good agreement with the experimental data. In contrast, a negative binary interaction parameter k(ij) had to be introduced to model phi of ternary systems salt + amino acid salt + water in accurate agreement with the experimental data.
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