الفهرس 
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Abstract
1. Determine dissociation constants (pKH) of ligands at different temperatures by potentiometeric titrations. 2. Determine stability constants (logK) of the formed complexes by potentiometeric titrations. 3. Determine the thermodynamic parameters of the dissociation constants of ligands and for the stability constants of the formed complexes. 4. Studies the effect of the azopyrazolone compounds and some of their metal complexes on the microorganisms. 5. Studies the effect of the azopyrazolone compounds on Csteel as inhibitors in 2M HCl by weight loss method and galvanostatic polarization method. 6. Studies the effect of the rate of corrosion on Csteel. 7. Studies the synergistic effect of ( I , Br and SCN ) to increase the effect of inhibitors. 8. Calculate some of the thermodynamic parameters for adsorption process.