Evaluating the thermodynamic consistency of experimental data for HF+H2Oat 101.325 kPa

In this work we examine the thermodynamic consistency of the solution property data presented from three literature sources for a mixture of hydrogen fluoride and water at 101.325 kPa. The current work utilizes the Direct Test that allows for a discrete analysis of the experimental data rather than a conclusion on the data set as a whole. By using a three-parameter Margules equation along with an equation of state for determining vapor-phase fugacity coefficients, we find that at above 60% HF the experimental data become increasingly inconsistent. Additionally, we utilize Barker's method along with temperature-dependent Margules equation parameters to report model-predicted vapor-phase compositions that offer a compromise among the three experimental data sets. Discussion on this work relative to recent simulation results for this system is provided.