Abstract
The reductions of Zn(II), In(III) and Eu(III) at a dropping mercury electrode have been studied in sodium gluconate solutions at 30 °C ( μ = 1.0). The reduction is diffusion controlled but is reversible only in the presence of gluconate ion with Eu(III). The kinetic parameters K s and α have been calculated by Ceiling's method. K s was found to be of the order of 10 −3 cm s −1 showing that the reduction is a completely quasi-reversible process for Zn(II) and In(III). The stability constants and composition have been calculated by DeFord and Hume's method as modified by Irving. Mihailov's mathematical method and Lingane's method were used to calculate the stability constants of the Eu(III)-gluconate system. Zn(II) and In(III) form five complexes each; Eu(III) forms only two complexes.
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