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Journal Article 
Apparent association constants of HgCl2 in presence of Kryptofix-22 in mixed aqueous-organic solvents 
El-Khouly, AA; Gomaa, EA; Abou El-Leef, S 
Bulletin of Electrochemistry
ISSN: 0256-1654 
The apparent association, dissociation and triple ion association constants (K-A, K-D and K-3 respectively) of HgCl2 in presence of Kryptoftx-22 (1, 7,10,16-tetraoxa-4,13-diaza-cyclo-octadecane) in pure water- and in mixed water-organic solvents using different proportions of each, were determined from the conductometric measurements. The hydroorganic solvents used were methanol (MeOH), ethanol (EtOH) as anaphiprotic hydrogen bond acceptor-donor solvents (HBAD), dimethyl sulfoxide (DMSO), 1,4- dioxane (DI) as hydrogen bond acceptor solvents (HBA) and acetonitrile (AN) as (HBA-HBD) solvent. Moreover, the molar solvated volumes (V), Van der Waals volumes (V-w), electrostriction volumes (V-e), activity coefficients (gamma(+/-)), dissociation degree values (alpha), molar and limiting conductances (Lambda and Lambda(0) respectively). Walden product values (Lambda(0) eta(0)), fluidity ratios (R-x), free energies of association (DeltaG(A)) and transfer free energies of association (LambdaG(t)) were carefully calculated. The implications of the results with regard to the specific solute-solvent interactions were extensively discussed. 
activity coefficient; association and dissociation constants; conductometry electrostriction volume; free energy of association; kryptofix; solute-solvent interactions; solvated volume; transfer free energy of association; Walden product value 
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