Summary
A universal potentiometric acid/base titration system using a two-phase mixture of cyclohexanone/water has been developed. The potential of the electrodes is stable, brought about by the aqueous phase. The presence of the solvent improves the titration reaction by extraction of the reaction products as organic acid or base from the equilibrium into the organic phase. Titrations to a preset endpoint are possible. The high reproducibility makes the method suitable for quantitative evaluations, and in addition qualitative identification of the titrated substances may be carried out by means of the “apparent” pK-values. These are more specific than in water, due to the coefficient of distribution in the aqueous/organic phase. First the method serves as a valuable supplement, and secondly as an alternative for the existing technique of “non-aqueous titrations”.
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Dank. Herrn Dr. J. Knöbel sei an dieser Stelle für mannigfache Hilfe und Beratung gedankt.
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Wolf, S. Ein universelles System für 2-Phasen-SÄure/Base-Titrationen. Z. Anal. Chem. 333, 624–628 (1989). https://doi.org/10.1007/BF00496934
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DOI: https://doi.org/10.1007/BF00496934