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

Abstract

HENRYK PIEKARSKI. ALINA PIEKARSKA, and STEFANIA TANIEWSKA-OSINSKA. Can. J. Chem. 62, 856 (1984).The enthalpy of Nal 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 c::? on solvent composition was studied. The cnthalpic pair interaction coefficients hEN for Nal-alcohol in water and Nal-water in alcohols were determined, and the effect of temperature on llEN values in the systems under study was analyzed. Introduction While calorimetric investigations of electrolyte solutions in water -aliphatic alcohols have often been conducted at various laboratories, there is little data on the effect of temperature on the thermochemical properties of electrolyte-alcoholwater systems in the whole range of mixed-solvent composition (1). In view of this we decided to measure the enthalpy of NaI solution in methanol, ethanol, propanol, and isopropanol mixtures with water over the entire range of mixed-solvent concen-

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

“…1 enthalpy of NaCl solution in water mixtures of isopropanol, 2-methoxyethanol, 2-ethoxyethanol shows a maximum analogous to that observed in other wateralcohol mixtures hitherto analyzed (4,(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23). It is generally accepted that this maximum is connected with the structuremaking or -stabilizing effect of the added alcohol on water (24)(25)(26)(27)(28).…”

Enthalpies and Entropies of Transfer of Electrolytes and Ions from Water to Mixed Aqueous Organic Solvents

“…There are two sets of calorimetric data available for NaI from the Łodz group. 15,84,137 The values are in reasonable agreement where comparison is possible (x 1-PrOH e 0.4), but in the absence of independent confirmation, their averages have been classified as Tentative. A similar situation exists for the two KCl data sets from the Ivanovo group.…”

“…There are two sets of calorimetric data available for NaI from the Łodz group. ,, The values are in reasonable agreement where comparison is possible ( x 1 - PrOH ≤ 0.4), but in the absence of independent confirmation, their averages have been classified as Tentative. A similar situation exists for the two KCl data sets from the Ivanovo group. , In contrast, for CsI there are two independent calorimetric data sets 90,137 that are in excellent agreement, where comparison is possible (at x 1 - PrOH ≤ 0.3), enabling their averaged values to be Recommended.…”