Isopiestic vapor pressure measurements are performed to study the ternary KCl + KBr + H₂O system at 298.15 K. The modeling purposes are 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 4.9 mol kg^–1 with various ionic strength fractions of KCl (y_B = m_KCl/(m_KCl + m_KBr) = 0.25, 0.51, and 0.75) . Finally, mean activity coefficients (γ_±), osmotic coefficients (φ), and excess Gibbs free energies (G^ex) are calculated and compared using the extended Pitzer (EP) and the Pitzer–Simonson–Clegg (PSC) equations.

中文翻译：

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298.15 K下KCl和KBr水性混合物的活度系数，渗透系数和吉布斯自由能的测定

进行了等压蒸气压测量，以研究298.15 K下的三元KCl + KBr + H ₂ O系统。基于三元系统的渗透系数实验回归，达到了建模目的。目前的计算是针对电解质浓度范围从0.3到约4.9 mol kg ^–1以及各种离子强度分数的KCl（y _B = m _KCl /（m _KCl + m _KBr）= 0.25、0.51和0.75）进行的。最后，平均活度系数（γ _±），渗透系数（φ）和多余的吉布斯自由能（G ^ex）是使用扩展的Pitzer（EP）和Pitzer–Simonson–Clegg（PSC）方程计算和比较的。