What is Freundlich adsorption isotherm ?

Explanation:-

The variation in the amount of gas adsorbed by the adsorbent with pressure at constant temperature can be expressed by means of a curve termed as adsorption isotherm.

According to freundlich isotherm,

    The extent of adsorption of a gas per unit mass of adsorbent depends upon the pressure of that gas.

I.e

Look at the Graph,(x/m) vs (p)

Equation (1) is the general form of freundlich adsorption isotherm.

Case-1(at low pressure)

If  x/m =kp¹

That implies 1/n=1

I.e n=1

So at low pressure freundlich adsorption isotherm holds good because initially their is more adsorption occur.

Case-2(at high pressure)

If x/m=constant

 i.e1/n=0

That implies n=infinity

So at high pressure x/m independent on pressure because after saturation pressure their is no adsorption occur due to no space on adsorbent.

At saturation pressure

Amount of gas adsorbed=amount of gas desorbed.

Look at the logarithm graph of equation (1)

This is all about freundlich adsorption isotherm.

For better understanding read NCERT 

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