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Rakiba Anjum posted an Question
January 16, 2021 • 19:14 pm
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30 points
30 points
- IIT JAM
- Chemistry (CY)
At what condition langmuir adsorption behave as freundlich adsorption
at what condition Langmuir adsorption behave as freundlich adsorption
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Amol ashok pawar![best-answer]()
Freundlich gives you the amount absorbed per unit mass of absorbate, and has this absorbtion fraction be the nth root of the pressure, with n being a material-specific constnat. Langmiur gives the surface coverage, so it only allows the surface of a material to be used for sorption. Also, the functional relationship is not a root, but an inverse of the pressure multiplied by the pressure. Qualitatively, in the limits, both seem similar, but they differ in their details and will give different answers. In the Langmuir model, it is assumed that at maximum coverage, there is only a monomolecular layer on the surface. This means that there is no stacking of adsorbed molecules. The Freundlich isotherm does not have this restriction.