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| Format: | Artículo científico |
| Language: | en |
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Universidade Estadual Paulista Júlio de Mesquita Filho
2006
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| Online Access: | https://www.redalyc.org/articulo.oa?id=42931205 |
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Table of Contents:
- Electrometric studies on formation of cerium vanadates as a function of pH E. A. Medeiros S. Prasad V. D. Leite R. A.C Santana Química vanadates electrometry cerium vanadates The precise nature of the reaction between nitric acid and sodium ortho-vanadate solutionshas been studied by means of electrometric techniques involving potentiometric and conductometrictitrations. The well defined inflections and breaks in the titration curves confirm the existence of theanions, pyro-V2O74-, meta-VO3- and poly-H2V10O284- corresponding to the ratios of VO43-:H+ as 1:1,1:2 and 1:2.6 in the neighborhood of pH 10.5, 7.4 and 3.6, respectively. The interaction of cerium(III)nitrate with sodium vanadate solutions, at specific pH levels 12.4, 10.5, 7.4 and 3.6 was also studiedby potentiometric and conductometric titrations between the reactants. The end-points obtained fromthe sharp inflections in the titration curves provide definite evidence for the formation and precipitationof cerium ortho-Ce2O3.V2O5, pyro-2Ce2O3.3V2O5 and meta-Ce2O3.3V2O5 vanadates in the neighborhoodof pH 7.4, 6.2 and 4.8, respectively. Analytical investigations on the precipitates formed confirmthe results of the electrometric study. 2006 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42931205 en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Num.2 Vol.31