Investigations on the Formation of Copper Polyvanadates as a Function of pH

The formation and composition of copper vanadates obtained by the interaction of copper sulfate with different sodium vanadates (ortho, pyro, meta and poly) have been studied by means of electrometric techniques involving glass electrode and conductometric titrations between the reactants at several...

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Bibliographic Details
Published in:Journal of the Brazilian Chemical Society 2002-09, Vol.13 (5), p.618-623
Main Authors: Prasad, Shiva, Brito, André L. F., Muniz, Ana C. S., Leite, Valderí D.
Format: Article
Language:English
Subjects:
CHEMISTRY, MULTIDISCIPLINARY
copper
electrometry
polyvanadates
vanadates
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Summary:The formation and composition of copper vanadates obtained by the interaction of copper sulfate with different sodium vanadates (ortho, pyro, meta and poly) have been studied by means of electrometric techniques involving glass electrode and conductometric titrations between the reactants at several concentrations in aqueous and aqueous-ethanolic media. The well defined inflections and breaks in the titration curves provide cogent evidence for the formation and precipitation of copper ortho-3CuO.V2O5, pyro-2CuO.V2O5 and meta-CuO.V2O5 vanadates in the vicinity of pH 8.1, 7.4 and 6.2, respectively. The studies on formation of copper poly-vanadate failed to give any dependable results. Analytical investigations of the compounds formed confirm the results of the electrometric study. The precipitation of copper ortho-vanadate is almost quantitative and the glass electrode titrations ofers a simple and rapid method for determination of vanadium(V) in solutions.
ISSN:0103-5053
1678-4790
DOI:10.1590/S0103-50532002000500012