Dissolution enthalpy of NaCl in aqueous nonelectrolyte solutions at 298.15 K. Analysis of electrolyte–nonelectrolyte enthalpic pair interaction coefficients in aqueous solution

1986 ◽  
Vol 64 (11) ◽  
pp. 2127-2131 ◽  
Author(s):  
Henryk Piekarski
Keyword(s):  
Water Structure ◽  
Vapour Phase ◽  
Pair Interaction ◽  
Point Of View ◽  
Enthalpies Of Solution ◽  
High Dilution ◽  
Interaction Coefficients ◽  
Enthalpic Pair Interaction Coefficients ◽  
Nonelectrolyte Molecule ◽  
Heat Capacity Of Transfer

Enthalpies of solution of NaCl in aqueous solutions of isopropanol, s-butanol, 2-methoxyethanol, 2-ethoxyethanol, acetone, and N,N-dimethylformamide were measured. The results of enthalpy measurements were analyzed from the point of view of the effect of added nonelectrolyte on water structure, and enthalpic pair interaction coefficients hxy{(Na+ + Cl−)–nonelectrolyte} were calculated and compared with appropriate data for (Na+ + I−)–nonelectrolyte pairs. The group additivity concept appeared to be useful for the analysis of calculated hxy coefficients. The correlations between hxy and the functions characterizing different properties of the solutes under study were examined. It was shown that the correlation with the heat capacity of transfer of the nonelectrolyte molecule from the vapour phase to high dilution in water was the most promising. The interpretation of observed correlations was proposed.

Enthalpies of solution of urea in water–alkanol mixtures and the enthalpic pair interaction coefficients of urea and several nonelectrolytes in water

1986 ◽  
Vol 64 (9) ◽  
pp. 1721-1724 ◽  
Author(s):  
Henryk Piekarski ◽  
Gus Somsen
Keyword(s):  
Heat Capacity ◽  
Hydrophobic Hydration ◽  
High Water ◽  
Pair Interaction ◽  
Heat Capacity Change ◽  
High Water Content ◽  
Enthalpies Of Solution ◽  
Interaction Coefficients ◽  
Enthalpic Pair Interaction Coefficients ◽  
Capacity Change

Enthalpies of solution of urea in binary mixtures of isopropanol, s-butanol, and ethoxyethanol with water have been measured at high water content. Those in the binaries isopropanol + water and ethoxyethanol + water show endothermic maxima at 8 and 4 mol% alkanol, respectively. Enthalpic pair interaction coefficients are calculated for the interactions between urea and the alkanols and discussed in connection with these coefficients for interactions between urea and other nonelectrolytes and between N,N-dimethylformamide and several nonelectrolytes. The enthalpic pair interaction coefficients correlate linearly with the heat capacity change on hydration of the nonelectrolytes and with the enthalpy of hydrophobic hydration of the alkanols.

Dissolution enthalpy of NaI in water–alcohol mixtures at 288.15 and 308.15 K. Enthalpy of interaction in electrolyte–alcohol–water systems

1984 ◽  
Vol 62 (5) ◽  
pp. 856-859 ◽  
Author(s):  
Henryk Piekarski ◽  
Alina Piekarska ◽  
Stefania Taniewska-Osińska
Keyword(s):  
Mixed Solvent ◽  
Pair Interaction ◽  
Water Systems ◽  
Effect Of Temperature ◽  
Solvent Concentration ◽  
Interaction Coefficients ◽  
Enthalpic Pair Interaction Coefficients ◽  
Alcohol Water ◽  
Alcohol Mixtures ◽  
Water Alcohol

The enthalpy of NaI solution was determined in water mixtures with methanol, ethanol, propanol, and isopropanol in the entire range of mixed-solvent concentration at 288.15 and 308.15 K, and in water mixtures with s-butanol and tert-butanol in the range of 0–5 mol% alcohol at 308.15 K. The dependence of [Formula: see text] on solvent composition was studied. The enthalpic pair interaction coefficients hEN for NaI–alcohol in water and NaI–water in alcohols were determined, and the effect of temperature on hEN values in the systems under study was analyzed.

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