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Keywords
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Isopiestic vapor pressure, Extended Pitzer, Pitzer–Simonson–Clegg, Activity Coefficients, Osmotic Coefficient, Excess Gibbs Free Energies
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Abstract
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Isopiestic vapor pressure measurements are performed to study the ternary KCl + KBr + H2O system at 298.15 K. The modeling purposes achieved based on the experimental osmotic coefficients regression of the ternary system. The present calculations are conducted for electrolyte molalities ranging from 0.3 up to about 4.3 mol kg-1 with various ionic strength fractions of KCl ( yB= = 0.25 , 0.51 and 0.75 ) . Finally, mean activity coefficients (γ±), osmotic coefficients (φ) and excess Gibbs free energies (Gex) are calculated and compared using the Extended Pitzer (EP) and the Pitzer–Simonson–Clegg (PSC) equations.
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