The interaction of Co(II), Ni(II) and Cu(II) metal ions with N-(5-methyl-2-hydroxyacetophenone)-N’-(2- hydroxyacetophenone) ethylenediamine have been studied at 0.1M ionic strength in 70% Dioxane-water mixture by Bjerrum method as adopted by Calvin and Wilson. It is observed that Co(II), Ni(II) and Cu(II) metal ions form 1:1 complexes with ligand (L). The data obtained were used to estimate and compare the values of proton-ligand stability constant (pK) and metal-ligand stability constant (logK), from estimated data (pK and log K),