Data for the distribution of picric acid in a benzene-water system at 15◦C are shown in Table 10.P3. (Note that the concentrations are in molar units, and that Nerst’s “law” clearly does not apply to these data.) You wish to employ an equilibrium stage to extract picric acid from a water stream with a picric acid concentration of 0.02 g-mol/L using a pure benzene stream.* Assume q^I = q^II = 50 L/min. What fraction of the picric acid is removed?

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Table 10.P3. Distribution of picric acid between water and benzene. Data from F. Daniels, Outlines of Physical Chemistry, John Wiley, New York, 1948. Picric acid in benzene, c (g-mol/L) 0.000932 0.00225 0.0101 0.0199 0.0500 0.100 0.180 Picric acid in water, c (g-mol/L) 0.00208 0.00327 0.00701 0.0101 0.0160 0.0240 0.0336