lab9 - Introduction: The objective of this experiment is to...

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Introduction: The objective of this experiment is to determine the Langmuir and Freundlich isotherm for acetic acid /charcoal system. Also the specific area for charcoal will be determined. Langmuir Isotherm: In our system acetic acid will be adsorbed by charcoal surface. If chemisorption is limited to a monomolecular layer and all sites on surface are assumed identical and no interaction between adsorbed molecules exist then Langmuir isotherm is applicable. The fraction of the occupied surface is: θ = n/n m where n is the number of mole adsorbed per gram. n m is the number of moles per gram charcoal required to form a monolayer. The rate of adsorption is proportional to the number of unoccupied surface and with the concentration. Therefore: v a = k1 ( θ -1) c On the other hand the rate of desorption is proportional to the number of occupied surface: v d = k2 θ at equilibruim: k1 ( θ -1) c = k2 θ since k = k1/k2 and θ = n/n m C B /n = C B /n m + 1/k n m Plotting C B /n vs. C B should give us a straight line with slope = 1/ n
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This note was uploaded on 04/13/2011 for the course CHEM 311 taught by Professor Alial-habib during the Fall '09 term at King Fahd University of Petroleum & Minerals.

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lab9 - Introduction: The objective of this experiment is to...

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