Complex Formation of Acetic Acid with Ca(II) and Mg(II) Under Physiological Conditions |
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Authors: | Brahim Hacht |
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Institution: | (1) Laboratoire de Spéciation et de Surveillance de la Pollution en Méditerranée, Department of Chemistry, Faculty of Sciences, University Mohammed Ist, Oujda, 60000, Morocco |
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Abstract: | Potentiometric titrations of aqueous acetic acid alone and in the presence of Ca(II) or Mg(II) ions have been carried out
under physiological conditions at the temperature 37 °C and ionic strength 0.15 mol⋅dm−3 (NaCl) at different ligand-to-metal ratios. Changes in pH were monitored with a glass electrode calibrated daily in terms
of the hydrogen ion concentrations. Titration data within the pH range 2.5 to 6.6 were analyzed to determine stability constants
using the SUPERQUAD program. Different combinations of complexes were considered during the calculation procedure for both
systems, but evidence was found only for mononuclear ML and ML2 species. Speciation calculations based on the corresponding constants were then used to simulate the species’ distributions. |
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Keywords: | Acetic acid Calcium(II) Magnesium(II) Physiological conditions Stability constants |
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