Publicação: Electrometric investigations on formation of lanthanum molybdates as a function of pH
Carregando...
Data
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Soc Brasileira Quimica
Tipo
Artigo
Direito de acesso
Resumo
The precise nature of the reaction between lanthanum nitrate and sodium molybdate at specific pH levels 7.6, 5.5 and 4.1 has been studied by means of electrometric techniques involving potentiometric and conductometric titrations, in aqueous and alcoholic media using each reagent as titrant. Well-defined breaks and inflections in the titration curves provide cogent evidence for formation and precipitation of lanthanum normal-La2O3.3MoO(3), para- La2O3.7MoO(3) and octa-2 La2O3.24MoO(3) molybdates in the vicinity of pH 5.9, 4.8 and 4.2, respectively. Analytical investigations of the precipitates of lanthanum molybdates have also been carried out, which substantiate the results of the electrometric study.
Descrição
Palavras-chave
molybdates, lanthanum molybdates, electrometry
Idioma
Inglês
Como citar
Journal Of The Brazilian Chemical Society. Sao Paulo: Soc Brasileira Quimica, v. 15, n. 2, p. 246-252, 2004.
