Diffusion coefficients for the solute phenol blue in several binary li
quid solvent mixtures were measured at 298 K. The solvents were binary
mixtures of cyclohexane + acetone, cyclohexane + benzophenone, and cy
clohexane + toluene. Certain experiments were compromised because phen
ol blue strongly adsorbed on stainless steel when the solvent was cycl
ohexane-rich. In contrast, high local compositions of acetone, benzoph
enone, or toluene around the solute prevented solute adsorption during
the experiment.