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High Resolution Image Download MS PowerPoint Slide The surface tension γ of aqueous solutions of NaCl, NaBr, NaI, LiCl, KCl, MgCl 2, and Na 2 SO 4 (0.1 mol·kg –1 to 5 mol·kg –1 in maximum) was investigated within the atmospheric relevant temperature range of 263.15 to 293.15 K. The measured densities ρ of the aqueous inorganic salt solutions between 278.15 and 293.15 K are also reported. From experimental data the excess surface tension Δγ, the concentration (as molality m ) and temperature derivatives, (dγ/d m ) T, p and (dγ/d T ) p, m as well as thermodynamic quantities of surface formation such as surface excess entropy Δ s σ, surface excess Helmholtz energy Δ a σ, surface excess energy Δ u σ, and surface excess enthalpy Δ h σ were estimated. The surface excess entropy decreases slightly with increasing molality of the inorganic salt, which shows a weak order dependence of the water molecules on the salt concentration. The surface tension data and thermodynamic quantities complement existing data sets especially at temperatures below 283.15 K.
Giermann et al. (Tue,) studied this question.