What is an adsorption isotherm? Discuss the phenomenon of adsorption of gases on solids with the help of Freundllich adsorption isotherm.

Explanation

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= mass of 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 then the 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.