Abstract
The effect of supporting-electrolyte (LiCl) concentration on the first stage Cr(III) + e → Cr(II) of Cr(III) reduction on a stationary mercury electrode is studied by linear voltammetry. It is found that an increase in the LiCl molar concentration m from 0.4 to ≈7 weakly affects the position of the cathodic current peak potential EP1 corresponding to this process. In the mentioned concentration range, [Cr(H2O)6 – nCln]3 – n (0 ≤ n < 3) ions are preferentially reduced. The further increase in m up to 19.1 results in a substantial positive shift of EP1, which is associated with the formation (upon passing the complete hydration limit) of the [Cr(H2O)3Cl3] (n = 3) complex, which is followed by its reduction.
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