The estimation of the pK * HA of acids in seawater using the Pitzer equations

Details The estimation of the pK * HA of acids in seawater using the Pitzer equations The estimation of the pK * HA of acids in seawater using the Pitzer equations

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.2121m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 12, pp.2121-2129

Physics

1

Scientific paper

The equations of Pitzer have been used to calculate the stoichiometric ionization constants, pK * HA , for acids in NaCl media at 25°C. The calculated results for the ionization of HAc, H 2 O, B(OH) 3 , H 2 CO - 3 , H 3 PO 4 , H 2 PO - 4 , HPO 2- 4 , H 3 AsO 4 , H 2 AsO - 4 and HAsO 2- 4 are in good agreement with the measured values, providing higher order interaction terms ( and ) are used. The pK * HA measurements of these acids in NaCl media containing Mg 2+ and Ca 2+ were used to determine Pitzer specific interaction parameters at I = 0.7. With these Pitzer coefficients, it was possible to make reliable estimates for the activity coefficients of anions in seawater ( S = 35) that form strong interactions with Mg 2+ and Ca 2+ . The calculated activity coefficients yield reliable estimates for the pK * HA of acids in seawater.

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