Ionization of carbonic acid in sodium chloride solutions at 25°C |
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Authors: | Valerie Thurmond Frank J Millero |
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Institution: | (1) Rosenstiel School of Marine and Atmospheric Science, University of Miami, 33149 Miami, FL |
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Abstract: | The stoichiometric pK
1
*
and pK
2
*
for the ionization of carbonic acid has been determined from emf measurements in NaCl soluions to 6.0m at 25°C. Our results at low concentrations are in good agreement with the results of Harned and Bonner, of Dyrssen and Hansson and of Roy et al. The calculated values of pK
1
*
using Pitzer's equations agree with the measured values to ±0.01 pK units provided higher order terms are used. It was necessary to use a triplet interaction parameter () and higher order electrostatic terms (E) to calculate reliable values of pK
2
*
(±0.03 pK units) over the entire concentration range. These results demonstrate the reliability of the Pitzer equations to estimate activity coefficients in concentrated salt solutions. |
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Keywords: | Carbonic acid concentrated aqueous solutions ionization constants Pitzer's equations activity coefficients |
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