A Study of the Component Formats Effect on I,onization Constants for A Number Schiff Pyridine Water and Ethanol with Variant Temperature Degrees

Document Type : Original Article


Lecturer, Department of Chemistry, College of Education for Pure Sciences, University of Mosul, Iraq


This investigation was started by synthesis of four pyridine Schiff bases from the mother compound (Salicyladehyed), whose nomenclatures and structures are seen in the text. The structures of these imines were well confirmed from U.V. and I.R. spectra at melting points. The main objective of this study is the determination of Ka values for these mentioned imines at temperature rang (20-60) Co by conductivity measurement method. This method as found, Simple, precise and accurate. The thermodynamic parameters of ionization for acids were also estimated. This shows that the process of ionization of acidic compounds under study in water Solvent is non spontaneous ( +∆H) and is accompanied by an increase of order ( -∆S). A direct linear plots were obtained between pka for any acid versus the dielectric constant of acid and versus the dietetic constant of ethanol at the five different temperatures.
Finally, a suitable interpretation for any one of these thermodynamic parameters are given and discussed


Main Subjects

Volume 63, Issue 12 - Serial Number 12
December 2020
Pages 4975-4985
  • Receive Date: 20 December 2019
  • Revise Date: 25 February 2020
  • Accept Date: 26 May 2020
  • First Publish Date: 06 June 2020