4. During the adsorption of organic acid on a solid adsorbent, the following results were obtained:
С0 kmol/m3 0.018 0.031 0.062 0.126 0.471
X/m mol/kg 0.467 0.624 0.801 1.100 2.040
Construct an adsorption isotherm, write an adsorption equation and find the constants of the Freundlich equation.

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