| Popis: |
Molar enthalpies of dilution ΔdilHmofNa2CO3(aq) were measured from molality m = 1.45 mol · kg − 1to m = 0.008 mol · kg − 1at seven temperatures from T = 298 K toT = 523 K at the pressure p = 7 MPa, and at four temperatures fromT = 371 K to T = 523 K at the pressurep = 40 MPa. Molar enthalpies of dilutionΔdilHm of NaHCO3(aq) were measured fromm = 0.98 mol · kg − 1tom = 0.007 mol · kg − 1at 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. |
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