Abstract
The ternary interdiffusion coefficients of aqueous BaCl 2 -KCl solutions were measured recently by Gouy interferometry. Convection appeared to develop in the free-diffusion boundaries even when both of the heavy BaCl 2 and KCl components were more concentrated in the lower end of the solution column. This unusual behavior was attributed to large countercurrent coupled flows of KCl driven by the diffusing BaCl 2 . Yet the diffusion potential generated by a BaCl 2 concentration gradient is expected to drive cocurrent coupled flows of KCl
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