The enthalpy of dilution and thermodynamics of Na2CO3(aq) and NaHCO3(aq) from T = 298 K to T = 523.15 K and pressure of 40 MPa

D. A. Polya, E. M. Woolley, J. M. Simonson, R. E. Mesmer

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Molar enthalpies of dilution ΔdilHm of Na2CO3 (aq) were measured from molality m = 1.45 mol· kg-1 to m = 0.008 mol· kg-1 at seven temperatures from T = 298 K to T = 523 K at the pressure p = 7 MPa, and at four temperatures from T = 371 K to T = 523 K at the pressure p = 40 MPa. Molar enthalpies of dilution ΔdilHm of NaHCO3(aq) were measured from m = 0.98 mol· kg-1 to m = 0.007 mol· kg-1 at the same temperatures and pressures. Hydrolysis and ionization equilibria contribute substantially to the measured enthalpies under many of the conditions of this study. Explicit consideration of these reactions, using thermodynamic quantities from previous studies, facilitates a quantitative representation of apparent molar enthalpies, activity coefficients, and osmotic coefficients with the Pitzer ion-interaction treatment over the ranges of temperature, pressure, and molality of the experiments. © 2001 Academic Press.
    Original languageEnglish
    Pages (from-to)205-243
    Number of pages38
    JournalJournal of Chemical Thermodynamics
    Volume33
    Issue number2
    DOIs
    Publication statusPublished - 2001

    Keywords

    • Aqueous solutions of sodium carbonate and sodium hydrogencarbonate
    • Enthalpy of dilution

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