Organic Solvent Effect, Thermodynamic Study and Synergism Behavior for Extraction Efficiency of Cobalt (II) Complex with 1-[2-Pyridyl Azo] -2-Naphthol

Abstract

After pinpoint all optimum conditions for extraction Cobalt II as ion pair association complex or chleated complex with complexing agent 1- 2-pyridyl azo -2-naphthol which dimonirtrate max for complex extracted was 446nm more stable complex formation was at pH 7 and 60 g Co II 5ml with 1 10-4 M 1- 2-pyridyl azo -2-naphthol PAN dissolved in chloroform and shaking time 10 minutes The stoichiometry of complex extracted to the organic phase was 1 1 metal PAN Co PAN Cl- or Co PAN Cl- Extraction method was endothermic as well as thermodynamic parameters after calculated wa sH ex 0 0149 KJmol- Gex -58 81 KJ mol- and Sex 176 55 J mol- Synergism study show from the slope is appear there is one molecule of TBP or MIBK participated in the structure of complex extracted to the organic phase