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Spectrophotometric and potentiometric investigations of the H2PO −4 -HPO 2−4 equilibrium at elevated pressure and temperature

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Abstract

The second dissociation reaction of phosphoric acid has been studied Raman spectrophotometrically and potentiometrically at pressures up to 100 MPa and temperatures up to 473.2 K in solutions with ionic strengths from 0.3 to about 1.0 mol-kg−1. Molalities, of orthophosphate salts from 0.005 to 0.1 mol-kg−1 have been used. The changes of the widths at half-height and the Raman shifts for both H2PO −4 and HPO 2−4 ions with changing variables of state are reported. Stoichiometric equilibrium constants for the second dissociation reaction are evaluated.

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  1. Geochemical Group, Nuclear Chemistry Division, Hahn-Meitner-Institute für Kernforschung, D-1000, Berlin 39, Germany

    Peter Haufe

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  1. Peter Haufe
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Haufe, P. Spectrophotometric and potentiometric investigations of the H2PO −4 -HPO 2−4 equilibrium at elevated pressure and temperature. J Solution Chem 14, 73–85 (1985). https://doi.org/10.1007/BF00648897

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  • DOI: https://doi.org/10.1007/BF00648897

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