Q. Which of the following curve is in accordance with Freundlieh adsorption isotherm ?
Solution:
According to Freundlich adsorption isotherm at dynamic equilibrium
$\frac{x}{m}\propto P^{1/n} \frac{x}{m}\propto K_{P^{1/n}}$
where, $ \frac{x}{m}$ = Adsorption capacity,
$p $ = pressure
and K, n are constant for a given adsorbate and absorbent at particular temperature.
$\Rightarrow log\, \frac{x}{m}= log\, K+\frac{1}{n} log \, P$
A graph between log$\frac{x}{m} $ against log p give a m straight line with slope equal to $\frac{1}{n} $ and ordinate intercept equal to log K.
