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Surface Chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistrySurface Chemistry3 Marks
Question
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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Answer

Freundlich adsorption isotherm equation for adsorption of gases on solids:
$\frac{\text{x}}{\text{m}}=\text{kp}^\frac{1}{\text{n}}\ \ (\text{n > 1})$
or $\text{log} \ \frac{\text{x}}{\text{m}}=\text{log k}+\frac{1}{\text{n}}\text{log p}$
where x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p, k and n are constants which depends on the nature of the gas and adsorbent at a particular temperature.

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