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What is an adsorption isotherm? Discuss the phenomenon of adsorption of gases on solids with the help of Freundllich adsorption isotherm. |
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Answer» Solution :Adsorption ISOTHERM: The variation in the amount of gas adsorbed by the adsorbent with pressure at constant TEMPRETURE can be expressed by means of a curve known as adsorption isotherm. `to` freundlich adsorption isotherm equation is `(x)/(m)=k,p^(l//n)` x=mass of the gas adsorbed m= massof the adsorbent p,k and n are constansts. `to`k and n depend on the nature of the adsorbent and the gas at a paraticular tempreture . `to` The relation ship is genrally represnted in the from of a curve where x/m is PLOTTED against pressure. `to`These curves indicate that a fixed pressure there is a decrease in physical adsroption with rise of TEMPRATURE. `(x)/(m)=k.p^(1//4)` Applying logarithm `Log ""(x)/(m) = log K + (1)/(n) log P` `to` The validity of Freumdllich isotherm can be verified by plotting log`(x)/(m)`on y-axis and log p on x-axis. If is a straight LINE thenthe isothern is valid. `to` The slope of the straight line give the value of `1/n` `to` The intercept on the y-axis the value of log K.  
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