Studies on the Dissociation Equilibria in Propan-2-ol + Water Mixtures

Department of Chemistry, University of Kalyani, Kalyani-741 235

Manuscript received 26 July 1984, revised 24 December 1985, accepted 22 January 1987

The dissociation equilibitia for the reactions,

n-phen H $\rightleftharpoons$  n-phen  + H^{+                                                             (1)}

Fe (n-phen)₃⁺ + 3H⁺ $\rightleftharpoons$  Fe²+3n-phen H^{+                                (2)}

Fe (n-phen)${}_3^{2+}$ $\rightleftharpoons$  Fe²⁺+3n-phen                                         (3)

(where, n-phen is 5-nitro-1,10-phenanthroline) were determined spectrophotometrically in propan-2-ol +water mixtures at 298 K From the dissociation constant values for the reaction (1), the free energies of transfer of hydrogen ions from water to mixed solvents were calculated. The results were interpreted in terms solutesolvent interactions and solvent basicity.