A colored substance (B) is to be removed from a mineral oil by adsorption with clay particles at 25oC. The original oil has a color index of 200 units/l00 kg oil, while the decolorized oil must have an index of only 20 units1100 kg oil. The following experimental adsorption equilibrium data have been measured in a laboratory:(a) Fit the data to the Freundlich equation.(b) Compute the kilograms of clay needed to treat 500 kg of oil if one equilibrium contact isused.

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Cn, color units/ 100 kg oil 100 40 200 10 60 10 qu. color units/ 100 kg clay 2.2 7.0 5.4 4,4