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Solubility and Thermodynamic Properties of Dipotassium or Disodium Hydrogenphosphates in Aqueous Solutions at Various Temperatures

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Abstract

In this investigation, calculated and experimental solubilities of the binary aqueous solutions of dipotassium hydrogenphosphate and disodium hydrogenphosphate have been determined at various temperatures. The experimental solubilities of aqueous solutions were performed for K2HPO4 and Na2HPO4 from ms(exp) = 9.66 to 15.63 mol·kg−1 and ms(exp) = 0.83 to 6.60 mol·kg−1, respectively, from 298.15 to 353.15 K. The calculated solubility needs thermodynamic properties of the binary systems based on the water activity measurements. Therefore, the water activities of K2HPO4 and Na2HPO4 aqueous solutions were measured from dilute to the saturated solution, using the hygrometric method at different temperatures. The related thermodynamic properties of K2HPO4(aq) and Na2HPO4(aq) were evaluated by the development of ion-interaction model. The Gibbs energies of dissolution \({\Delta G}_{\mathrm{diss}}^{^\circ }\) of K2HPO4 (s) and Na2HPO4 (s) and the solubility product were also determined at various temperatures.

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Authors and Affiliations

  1. Laboratory of Physical-Chemistry, Materials & Catalysis, Faculty of Sciences Ben M’Sik, University Hassan II-Casablanca, Casablanca, Morocco

    S. M. Aboufaris EL Alaoui, L. Ghallali, M. EL Guendouzi & A. Benbiyi

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  1. S. M. Aboufaris EL Alaoui
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  2. L. Ghallali
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  3. M. EL Guendouzi
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  4. A. Benbiyi
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Correspondence to M. EL Guendouzi.

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Aboufaris EL Alaoui, S.M., Ghallali, L., EL Guendouzi, M. et al. Solubility and Thermodynamic Properties of Dipotassium or Disodium Hydrogenphosphates in Aqueous Solutions at Various Temperatures. J Solution Chem 51, 802–815 (2022). https://doi.org/10.1007/s10953-022-01172-0

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  • DOI: https://doi.org/10.1007/s10953-022-01172-0

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