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Potentiometric and Thermodynamic Studies of Some Transition Metal Complexes with Ortho-Mercaptobenzoic Acid in Methanol-Water Medium

Tejinder Kaur and Anju Agrawal

The complex formation equilibria of some metal ions [Zn (II), Co (II), Ni (II), Cu (II)] with ortho mercaptobenzoic acid were determined by pH-titration method at constant ionic strength μ = 0.1 M (KNO3) at three different temperatures (25o C, 35o C, 45o C) in 40% (v/v) methanol-water and in 60% (v/v) methanol-water mixture at 25o C. The stability constants of various complexes were determined by various computational methods. The stability constants are in fair agreement with Irving-Williams order. The thermodynamic parameters have been calculated only for 40% (v/v) methanol-water mixture