Abstract
Equilibria and thermodynamic data for cerium dimer species were calculated for both the and systems. It was found that Ce(IV) has a tendency to form dimers, especially when the total cerium concentration is higher than 0.001 M. There are three major soluble dimer forms considered in this paper: , and , all having very similar standard potentials . When they coexist in solution, the concentration ratio of the Ce(IV) dimer to depends on the total cerium concentrations, the oxidizing agent, and in some cases the pH. Increasing the value of each individual factor favors the formation of dimers. It was also found that the direct oxidation of to dimers by appeared to be insignificant, but the oxidation of to the three dimers by would be much more favorable.
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