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Potentiometeric investigation on the complex formation equilibria involving Co(II), Ni(II), Cu(II) & Zn(II) with ethylenediaamine-N,N,N1,N1-tetraacetic acid and melonic acid have been made in solution at three different temps viz. (15±10, 35±10, 45±10C). Important thermodynamic parameters namely, change in Gibb’s free energy (DG0), change in enthalpy (DH0) and change in entropy (DS0) and stability constant have been determined potentiometrically at ionic strength of 0.1 M (KNO3). keywords: Ethylenediaamine-N,N,N1,N1-tetraacetic acid , Schiff base complexes, Transition metals, Formation constant.

A Potentiometric Studies of Ternary Complexes of Co(II), Ni(II), Cu(II) and Zn(II) with Ethylenediaamine-N,N,N1,N1-Tetraacetic Acid and Melonic Acid