5. When doxycycline was adsorbed on highly dispersed silica at pH=6 (phosphate buffer, silica sample 0.2 g, volume 20 ml), the following adsorption values ​​were obtained:
C*104 mol*l-1 0.5 1 2 4 8
a*105 mol*g-1 0.68 1.08 1.53 1.9 2.26
Which equation is best for describing the experimental data? Determine the parameters of this equation.

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