{"title":"The use of the Nb-Nb2O5 electrode as an indicator electrode in potentiometric acid-base titrations in fused KNO3","authors":"A. Baraka, A. Abdel-Razik, A.I. Abdel-Rohman","doi":"10.1016/0376-4583(85)90045-7","DOIUrl":null,"url":null,"abstract":"<div><p>An Nb-Nb<sub>2</sub>O<sub>5</sub> electrode was prepared by the electrolytic oxidation of niobium in molten KNO<sub>3</sub>. This electrode can be used as an indicator electrode in potentiometric acid-base titrations. It behaves reversibly and responds theoretically to the oxide ion concentration in molten KNO<sub>3</sub>. Its potential varies linearly with ln[O<sup>2-</sup>] and the line has a slope of 68 mV at 350 °C. The standard potential of the Nb-Nb<sub>2</sub>O<sub>5</sub>, O<sup>2-</sup> electrode, <em>i.e.</em> the potential at [O<sup>2-</sup>] = 1, is computed as -810 mV with respect to the Ag-Ag<sup>+</sup> reference electrode.</p></div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1985-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90045-7","citationCount":"11","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surface Technology","FirstCategoryId":"1087","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0376458385900457","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 11
Abstract
An Nb-Nb2O5 electrode was prepared by the electrolytic oxidation of niobium in molten KNO3. This electrode can be used as an indicator electrode in potentiometric acid-base titrations. It behaves reversibly and responds theoretically to the oxide ion concentration in molten KNO3. Its potential varies linearly with ln[O2-] and the line has a slope of 68 mV at 350 °C. The standard potential of the Nb-Nb2O5, O2- electrode, i.e. the potential at [O2-] = 1, is computed as -810 mV with respect to the Ag-Ag+ reference electrode.
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