Abstract
The stability of CrBr 2(H 2O) 4 + was investigated in strong acid medium (1.5–6 M) as a function of acid type and bromide concentration; HCl, HBr, HClO 4 and H 2SO 4 were used. Chromium tribromide was shown to provide a suitable working solution for at least 3 days, for the coulometric generation of chromium(II). The reduction was also studied at the D.M.E. Chromium(II) catalysed the aquation process, the effect being greatest in sulphuric acid. Conditions for 100% generating efficiency of chromium(II) were established; the range of current density for >99.9% current efficiency increased in the order HCl<HBr<HClO 4. Polarographic and spectrophotometric techniques showed that CrBr(H 2O) 5 2+ is the species reduced at the mercury cathode. A direct coulometric determination of titanium(IV) with electrolytically generated chromium(II) is described. Amounts of ca. 1 and 0.5 mg were titrated; the standard deviation for 20 determinations was ± 7 μg.
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