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Question 5

What is an adsorption isotherm? Describe Freundlich adsorption isotherm.



The plot between the extent of adsorption (x/m) against the pressure of gas (P) at constant temperature (T) is called the adsorption isotherm.

Freundlich adsorption isotherm:

Freundlich adsorption isotherm gives an empirical relationship between the quantity of gas adsorbed by the unit mass of solid adsorbent and pressure at a specific temperature.

From the given plot it is clear that at pressure PS,(x/m) reaches the maximum valve. Ps is called the saturation pressure. Three cases arise from the graph now.

On plotting the graph between log  (x/m)  and log P, a straight line is obtained with the slope equal to (1 / n) and the intercept equal to log k.



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