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Multicomponent diffusion properties for the tetra(ethylene glycol) (PEG4)-sodium chloride-water ternarysystem are investigated at constant salt concentration (0.5 mol dm-3) and a wide range of PEG4 concentrationapproaching 3.0 mol dm-3 (60% volume fraction). Cross-velocity correlation (counterflows) for any pair ofcomponents in this ternary system is determined. Comparison between the exact multicomponent approachand the pseudobinary approximation, which is based on the assumption that the PEG4-water mixed solventcan be treated as one component, shows how the latter approach is misleading in describing the electrolytediffusion properties in mixed solvents. Our results show strong coupling between the fluxes of NaCl andPEG4, which is attributed to the NaCl-PEG4 nonpreferential interactions in water. Moreover, the behaviorof the NaCl and PEG4 chemical potentials as a function of the system composition can be quantitatiVelyextracted from our diffusion measurements with the help of some interesting observations about the viscosityand conductivity properties of the system

Multicomponent Diffusion in Crowded Solutions. 2. Mutual Diffusion in the Ternary System Tetra(ethylene glycol)−NaCl−Water