الملخص

This research is concerned with the preparation of four aliphatic or aromatic oximes, prepared from benzil and heterocyclic aldehydes and the determination of their pKa by potentiometric method. It is proved in this study that oximes under investigation have hydrogen bonds, as identified earlier by different physical method. A comparison ofpKa between these oximes are performed at constant temperature and solvent composition. The potentiornetric method was founded to be fast, simple and precise with accLlracy in the rang +0.001 pKa unit.The study comes to conclusion that the type of isomer (alpha or beta) in oximes, have a noticeable influence on pKa value of isomer.