The complex formation between zinc(II), cadmium(II), mercury(II) and benzoate ions was studied potentiometrically with glass electrode at different temperatures. The measurements have been performed in a perchlorate medium of the unit ionic strength at 25, 30, 35 and 40 degrees C. The stability constants of the complexes were found in the order of increasing softness i.e. Zn(II)

Keywords:AQUEOUS-SOLUTION;THERMODYNAMICS;MANGANESE(II);COBALT(II)