Potentiometric Titration Method for the Determination of Solubility Limits and pKa Values of Weak Organic Acids in Water

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Analytical Chemistry. American Chemical Society (ACS). 2020, 92(14), pp. 9511-9515. ISSN 0003-2700. eISSN 1520-6882. Available under: doi: 10.1021/acs.analchem.0c00247
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The determination of solubility limits of compounds in water is unprecise and relies on certain prerequisites such as UV-Vis absorption activity. In this study we designed an experimental approach based on potentiometric titrations to determine solubility limits of various organic compounds by exploiting their pH-active carboxylic acid groups. By applying the law of mass action, utilizing a double-dosing method ensuring a constant compound concentration, it is possible to determine the intrinsic solubility limits, which are independent of the pH value. The derived equations enable the precise and fast determination of intrinsic solubility limits of organic compounds in aqueous solutions within 2 - 4 hours. Moreover, it is shown how the pKa value can be determined based on titrations carried out at two different compound concentrations.

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ISO 690WIEDENBECK, Eduard, Denis GEBAUER, Helmut CÖLFEN, 2020. Potentiometric Titration Method for the Determination of Solubility Limits and pKa Values of Weak Organic Acids in Water. In: Analytical Chemistry. American Chemical Society (ACS). 2020, 92(14), pp. 9511-9515. ISSN 0003-2700. eISSN 1520-6882. Available under: doi: 10.1021/acs.analchem.0c00247
BibTex
@article{Wiedenbeck2020-07-21Poten-50090,
  year={2020},
  doi={10.1021/acs.analchem.0c00247},
  title={Potentiometric Titration Method for the Determination of Solubility Limits and pK<sub>a</sub> Values of Weak Organic Acids in Water},
  number={14},
  volume={92},
  issn={0003-2700},
  journal={Analytical Chemistry},
  pages={9511--9515},
  author={Wiedenbeck, Eduard and Gebauer, Denis and Cölfen, Helmut}
}
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