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What is an adsorption isotherm? Describe Freundlich adsorption isotherm.

5.5  What is an adsorption isotherm? Describe Freundlich adsorption isotherm. 

 

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

Fig:- Adsorption isotherm

Freundlich adsorption isotherm- Freundlich gave an empirical relationship between the quantity of gas adsorbed by a unit mass of solid (adsorbent) and pressure (at a particular temperature).

  • At high pressure-       \frac{x}{m}=k.p^{0}    [independent of P]
  • At intermediate pressure    \frac{x}{m}=k.p^{\frac{1}{n}} for n>1                                                                                          k and n are constant (depend on nature of gas) Here x = mass of gas adsorbed, and                                                                         m= mass of adsorbent at pressure p

          On taking log both sides-

             \log\frac{x}{m}= \log(k)+\frac{1}{n}\log(p)

 

 

 

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