Class 12 Chemistry Surface Chemistry Adsorption isotherms

Adsorption isotherms

The variation in the amount of gas adsorbed by the adsorbent at constant temperature with change in pressure is shown by a curve called adsorption isotherm.

 

Freundlich adsorption Isotherm:

  • Freundlich proposed this relation to show a relation between the extent of adsorption and pressure.

If there are solutions involved, the above equations become

Where x -> amount of adsorbate

m-> mass of adsorbent

p-> pressure

C-> concentration of adsorbate

K and n->constants , n>1 always

Looking at equation 2, as we plot log x/m versus log p on a graph,  we get a straight line with slope=1/n and y- intercept= log k.

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