Thermodynamic Investigation of NaClO3 Solubility in the Mixed Solvent Medium and the Related Ion – Pair Formation at Different Temperatures

Mehran Aghaie; Roshanak Kishani

doi:10.6000/jascm.v4i4.3491

Authors

Mehran Aghaie Faculty of Chemistry, North Tehran Branch, Islamic Azad University
Roshanak Kishani Faculty of Chemistry, North Tehran Branch, Islamic Azad University

DOI:

https://doi.org/10.6000/jascm.v4i4.3491

Keywords:

Mixed solvent, Ion- pair, Thermodynamic function, The extended Debye-Hückel model

Abstract

Using the evaporating method, the solubility of sodium chlorate was determined in the various mixed solvents (water + ethanol + propanol) at various temperatures. The results showed that the solubility of NaClO₃ decreases with increasing the mass percent of ethanol and propanol. On the other hand, the solubility of NaClO₃ increases with increasing the temperature. In addition, the equilibrium constant of ion pair formation, K_IP,for the reaction

Na⁺_(aq) + ClO₃^-_(aq)-->Na⁺ClO₃^-_{(Ion Pair)} was estimated upon Fuoss contact ion pair model and then, the values of ion-pair concentrations were determined by using the extended Debye-Hückel model and iteration calculations in various mixed solvents and various temperatures . Finally the value of thermodynamic solubility product constant, K_sp(th), and the values ∆H°, ∆S° and ∆G° of ion-pair formation were estimated in the mixed solvent media.

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