Abstract
The chemistry of vanadium in solution has been investigated over the entire pH range, with special emphasis on rare earth precipitates. Whereas prior investigators were confronted with an instability range between pH 5.5–7.5 due to precipitation of hydrous V 2O 5, the present work did not encounter such a barrier. Thus, the complete pH range could be surveyed by starting with VO 2+ ion plus a rare earth in strong acid solution and titrating with strong base plus an oxidizing agent. The VO 2+ ion appears to be oxidized early in the titration to form VO 2 + ion which then condenses in solution to form vanadate anionic precipitates.
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