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The effect of temperature and pressure on the protonation ofo-phosphate ions at 348.15 and 398.15 K, and at 1.52 and 12.50 MPa

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Abstract

Flow calorimetry has been used to study the interaction of HPO 2−4 and H2PO −4 with H+ in water at temperatures of 348.15 and 398.15 K and at pressures of 1.52 and 12.50 MPa. The protonations of HPO 2−4 and H2PO −4 are exothermic and endothermic, respectively, under these experimental conditions. Under the conditions of this study, the effect of pressure on the enthalpy changes for both reactions is small. Equilibrium constant K, enthalpy change ΔH, and entropy change ΔS values are given for the protonation reactions at each temperature. These values are compared with those reported in the literature. Incorporation into the calculation procedure of reactions involving association between protonated phosphate species to form hydrogen-bonded dimers does not result in better fits of the experimental data.

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Authors and Affiliations

  1. Departments of Chemistry and Chemical Engineering, Brigham Young University, 84602, Provo, UT

    R. M. Izatt, S. E. Gillespie, J. L. Oscarson & P. Wang

  2. Departmento Quimica Fisica I, Universidad Complutense, E-28040, Madrid, Spain

    J. A. R. Renuncio & C. Pando

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  1. R. M. Izatt
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  2. S. E. Gillespie
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  3. J. L. Oscarson
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  5. J. A. R. Renuncio
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  6. C. Pando
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Izatt, R.M., Gillespie, S.E., Oscarson, J.L. et al. The effect of temperature and pressure on the protonation ofo-phosphate ions at 348.15 and 398.15 K, and at 1.52 and 12.50 MPa. J Solution Chem 23, 449–468 (1994). https://doi.org/10.1007/BF00972612

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  • DOI: https://doi.org/10.1007/BF00972612

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