Sircar and Myers [J. Phys. Chem., 74,2828-2835 (1970)] measured liquid-phase adsorption at 30?C for a binary mixture of cyclohexane (1) and ethyl alcohol (2) on activated carbon. Assuming no adsorption of ethyl alcohol, they used (15-34) to obtain the following results:

(a) Plot the data as q1 against x1. Explain the shape of the curve.

(b) In what regions of concentration could the Freundlich isotherm be fitted to the data? Make thefits.

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qi, mmol/g qi, mmol/g 0.042 0.295 0.440 0.065 0.485 0.470 0.000 0.051 0.517 0.521 -0.129 0.072 0.586 0.537 -0.362 0.148 0.669 0.610 -0.643 0.160 0.661 0.756 -1.230 0.213 0.583 0.848 -1.310 0.216 0.595 0.893 -1.180 0.249 0.532 0.920 -1.230 0.286 -0.996 0.341 0.383 0.953 0.391 0.192 0.974 -0.470