Abstract
The reduction of Sn(IV) ions in solutions of different chloride concentrations has been studied chronopotentiometrically using a planar mercury electrode. The reduction is complicated by chemical complex formation which precedes the electrode reaction. For the reduction of the Sn(IV) ion in 5 M HCl, the product, αnα, is 0.42 and the value 3.5·10−3 cm/sec is calculated for the heterogeneous rate constant, kf, h0. In a solution of 4 M NH4Cl in I M HCl, the electrode process is reversed by a catalytic reaction with H2O2, in which a re-oxidation of the tetrachloro-tin(II) complex takes place. A value, D=0.78·10−5 cm2/sec, is obtained for the diffusion coefficient of the reducible Sn(IV) complex. Furthermore, it is shown that the chloride concentration of the Sn(IV) solution has to be about 10 M in order to avoid any influence of the preceding chemical reaction on the electrode reaction.
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