The coulometric titration of acids and bases in dimethylsulfoxide media

M. Bos, S.T. IJpma, E.A.M.F. Dahmen

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    The coulometric titration of 20–200 μeq of acids and bases in DMSO media is described. In the titration of bases, the electro-oxidation of hydrogen at a platinized platinum electrode is used as the source of protons. The conditions for 100 % current efficiency at this electrode are low current density to avoid passivity and regular treatment of the electrode with potassium dichromate—sulfuric acid to remove a poisoning sulfide layer. The accuracy of the titrations is better than ±1 %. Very weak acids like phenols (pKa (DMSO) ≈16) can be titrated successfully. Tris(hydroxymethyl)aminomethane is the weakest base titrated.
    Original languageEnglish
    Pages (from-to)39-47
    JournalAnalytica chimica acta
    Publication statusPublished - 1976


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