Abstract
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 2O, B(OH) 3, H 2CO − 3, H 3PO 4, H 2PO − 4, HPO 2− 4, H 3AsO 4, H 2AsO − 4 and HAsO 2− 4 are in good agreement with the measured values, providing higher order interaction terms (θ and ψ) 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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