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Substituent Effect on the Association Phenomenon of an Aqueous Solution of Benzylidene Substituted Aniline at Different Temperatures | ||
| Rafidain Journal of Science | ||
| Article 5, Volume 24, Issue 5, 2013, Pages 51-65 PDF (0 K) | ||
| DOI: 10.33899/rjs.2013.74518 | ||
| Authors | ||
| Mohammed A. Al-Iraqi; Yaser O. Al-Allaf; Kawther H. Al-Naimi | ||
| Abstract | ||
| Conductivity parameters of an aqueous solution of benzylidene substituted anilines (I-IV) have been determined at five different temperatures in the range of 283.15-318.15 ºK, through accurate conductance measurements. The obtained data were analyzed in accordance to Lee-Wheaton equation taking into account the activity of the electrolyte in the solution. The conductance measurement results were used to determine the association constants (KA) of ion-pairs, the mean distance between ions in solution, in addition to the molar conductance at infinite dilution (Λo¬) for the free ion in the solution. The dependence of (KA) values on the temperature has been examined by plotting Log KA against the reciprocal values of temperature (1/T), which showed linear relationship, where (KA) values decrease with increasing temperature. Moreover, the enthalpy (ΔH), Gibbs free energy (ΔG) and the entropy (ΔS) have been derived from this linear relationship. | ||
| Keywords | ||
| Ion; Association; conductance; Schiff bases; benzylidene substituted aniline; Lee; Wheaton equation | ||
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