In continuation of the previous work here we are going to report stability constant values of transition metals like Cu(II) , Ni(II), Co(II) and Zn (II) with Schiff;s base ligand. Schiff's base ligands were synthesized by the condensation reaction of β-Naphthaldehyde with 7-Hydroxy naphthalene -2 -amine .Nitrate salts of divalent cobalt, nickel, copper and zinc were estimated by usual methods. Ligand was analysed for elements by standard method. pH metric titrations were carried out with the

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... p of digital pH meter and stability constant of complexes of these metals with the ligands synthesized were computed by Irving-Rossotti technique modified by Calvin-Bjerrum. The stability constant values of metals for the given ligand were found to be in the order Cu(II) > Ni(II), Co(II) > Zn (II). This result is in agreement with the natural order proposed by Irving-William.