In reference to Freundlich adsorption isotherm, write the expression for adsorption of gases on solids in the form of an equation.

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#### Solution

Freundlich adsorption isotherm for adsorption of gases on solids:

xm=Kp1nIt can also be written aslogxm=log K + 1nlog p">

\[\frac{x}{m} = K p^\frac{1}{n} \]

\[\text{It can also be written as}\]

\[\log\frac{x}{m} = \log K + \frac{1}{n}\log p\]

where *x* is the mass of the adsorbate, *m* is the mass of the absorbent and *p* is the pressure of the gas and n is a constant which is greater than 1.

Concept: Adsorption Isotherms

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