A diaphragm diffusion cell is used to determine diffusivities in aqueous solutions by measuring the mass transfer flux across an inert macroporous slab that separates two well-mixed compartments. In this particular case, the slab is 1.0 mm thick and has a porosity  = 0.5 and a tortuosity factor  = 2.0. The temperature is 298 K. Assuming that diffusion through the macroporous slab is controlling:

(a) Predict the mass transfer flux of K⁺ and Cl^- if compartment 1 is filled with a 0.1 M KCl solution and compartment 2 is filled with pure water.

(b) Predict the mass transfer flux of K⁺ and H⁺ if compartment 1 is filled with a 0.1 M KCl solution and compartment 2 is filled with a 0.1 M HCl solution.

FIGURE P.15.2:

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