The pH-dependence of entropy changes of metal-edta complex formation.
The entropy changes of Ca(2+)-, Mn(2+)-, Ni(2+)- and Pb(2+)-EDTA complex-formation reactions were measured at various pH-values. The entropy changes for the Ca, Mn and Pb complexes were practically independent of pH, but that of the Ni complex decreased considerably with pH. It is suggested that mixed-ligand (EDTA, water) complexes of Ni are formed at low pH.
Ogura
K
K
Department of Applied Chemistry, Yamaguchi University, Ube, Yamaguchi-Ken 755, Japan.
Takatu
K
K
Yosino
T
T