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Publication Detail
A Raman spectrographic and potentiometric study of aqueous lithium and potassium acetate complexation at temperatures from 20 to 200 °c
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Fournier P, Gout R, Oelkers EH
  • Publication date:
    01/08/2005
  • Pagination:
    881, 898
  • Journal:
    Journal of Solution Chemistry
  • Volume:
    34
  • Issue:
    8
  • Status:
    Published
  • Print ISSN:
    0095-9782
Abstract
The Raman spectra of aqueous NaOH-CH3COOH solution containing either LiCl or KCl were collected at temperatures from 20 to 200 °C. Interpretation of these spectra reveals significant aqueous LiCH 3COO0 formation, but no evidence of aqueous KCH 3COO0 formation. LiCH3COO0 dissociation constants generated from these data decrease with the increasing temperature from -0.25 at 20 °C to -1.08 at 200 °C. Potentiometric measurements were performed on similar solutions at temperatures from 25 to 90 °C. These results are in general agreement with the Raman spectral results. Significant aqueous Li-acetate complexing is observed; aqueous K-acetate complexing is far weaker than that of Li-acetate. Dissociation constants for aqueous LiCH3COO0 generated from the potentiometric measurements decrease from -0.20 at 25 °C to -0.62 at 90 °C, whereas those for aqueous KCH3COO0 decrease from ≥0.35 to -0.02 over this temperature range. © 2005 Springer Science+Business Media, Inc.
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