Activity coefficients for aminoacid+electrolyte mixtures by using Pitzer equations: dl-α-amino-n-butyric acid in mixed electrolyte solutions of neutral, acid and alkaline pH values

NaCl + CH3OH + H2O Mixture: Investigation Using the Pitzer and the Modified Pitzer Approaches To Describe the Binary and Ternary Ion–Nonelectrolyte Interactions

“…Table 4 shows the binary (ion−CH 3 OH) and triple (ion− ion−CH 3 OH, the ion−CH 3 The relatively large and negative values of the ion−alcohol binary interaction x AB (1,0) was interpreted as responsible for some association phenomenon between the Na + or Cl − ions and the CH 3 OH in these mixtures. 16,17 A galvanic cell containing an Na + -glass membrane and Ag/AgCl electrodes were also used for collecting the potentiometric experimental data at (298.15) K. The Pitzer ion-interaction parameters β (0) , β (1) , and C φ (not previously reported) for NaCl in different mass fractions x = 0.10, 0.20, 0.30, 0.40, and 0.50 of CH 3 OH in water at relatively high concentrations were determined, and the results were reported. The available literature data, specifically for the CH 3 OH mass fractions x = 0.10, 0.30, and 0.50 in H 2 O, are mainly limited up to the molality of 0.2 mol·kg −1 , in which the triple interaction Pitzer parameter C φ are neglected.…”

“…The relatively large and negative values of the ion−alcohol binary interaction x AB (1,0) was interpreted as responsible for some association phenomenon between the Na + or Cl − ions and the CH 3 OH in these mixtures. 16,17 Table 2. Comparison of Pitzer Ion-Interaction Parameters β (0) , β (1) , and C φ for NaCl in Different Mass Fractions of CH…”

“…Finally, the relatively large and negative values of the ion−alcohol binary interaction x AB (1,0) was interpreted as responsible for some association phenomenon between the Na + or Cl − ions and the CH 3 OH in these mixtures. 16,17 The modified Pitzer approach permitted the determination of various binary ion−solvent and ternary ion−ion−solvent interaction coefficients (not reported previously) which represent complementary data to the Pitzer binary and ternary ion−ion interaction coefficients. A comparison of the two models shows that the modified Pitzer approach presents a better fit of the mean activity coefficients for NaCl in MeOH− H 2 O mixtures based on the resulting roots of mean square deviation of their fits.…”

“…In eq 6, the ion−nonelectrolyte binary interaction parameter, χ, and its derivative, χ′, are expressed as 16,17 ) ξ and ω are the ternary interaction parameters of nonelectrolyte−ion−ion and nonelectrolyte−nonelectrolyte−ion, respectively. In principle, ξ and ω depend on the ionic strength of the solution, but their values are small, and their dependence on the ionic strength of the solution is not taken into account.…”

“…In eq 6, the ion−nonelectrolyte binary interaction parameter, χ, and its derivative, χ′, are expressed as 16,17…”