No abstract

The stoichiometry and the thermodynamic formation constant of the limiting complex of Ce(IV) were determined at 19.3 ± 1.0°C by using cyclic voltametry technique at a hanging mercury drop working electrode in concentrated bicarbonate/carbonate medium. The Ce(IV/III) redox potential was measured at pH varying from 9.3 to 10.6 and [ ] CO 3 2varying from 1.0 to 1.5 M by performing a CO 3 2titration with CO 2 gas. The 3 56is discussed under the experimental conditions used, log 10 ( b 5 IV ) £ 41.8 ± 0.5 (in molal units).