This paper aims to extend the application field of the hygrometric method to systems containing volatile electrolytes. In this way, the aqueous hydrochloric acid–water solution and the aqueous hydrochloric acid–potassium chloride–water system have been studied with the hygrometric method at the temperature 298.15 K. To take into account the hydrochloric acid volatility, we use a corrected ratio of droplet growth K^Adjusted = 0.0105 + 0.998·K^Exp (K^Exp is the measured ratio of droplet growth) obtained from experimental data of the hydrochloric acid–water system. The water activities and the corresponding osmotic coefficients are deduced from measurements of relative humidities of the HCl–KCl–H₂O system against total molality ranging from 0.3 to 7.5 mol·kg^–1 and for different ionic-strength fractions y of HCl y = I_HCl/(I_KCl + I_HCl)) of 1/3, 1/2, 2/3, 3/4, 10/11, and 15/16 at 298.15 K. The results obtained were correlated using the PSC model to predict the solute activity coefficients in a mixture for different compositions of the aqueous solution of the hydrochloric acid system. The obtained results are used to determine the solubility and excess Gibbs energy in the studied molality range.

中文翻译：

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吸湿法测定298.15 K盐酸水溶液中水活度的用途

本文旨在将吸湿法的应用领域扩展到含有挥发性电解质的系统。通过这种方法，已经在298.15 K的温度下使用吸湿法研究了盐酸-水溶液和盐酸-氯化钾-水溶液系统。考虑到盐酸的挥发性，我们使用校正后的比率从盐酸-水系统的实验数据获得的^调整后的液滴生长K^调整为0.0105 + 0.998· K ^Exp（K ^Exp是液滴生长的测量比率）。通过测量HCl–KCl–H ₂的相对湿度得出水活度和相应的渗透系数针对总摩尔浓度O系统从0.3〜7.5摩尔公斤· ^-1和对于不同的离子强度的馏分ÿ盐酸Ŷ =我_的HCl /（我_的KCl +余_的HCl的1/3）），1/2，2/3 ，在298.15 K时分别为3 / 4、10 / 11和15/16。使用PSC模型对获得的结果进行关联，以预测盐酸系统水溶液不同组成的混合物中的溶质活度系数。获得的结果用于确定溶解度和所研究的摩尔浓度范围内的过量吉布斯能量。