Question

Freundlich adsorption theorem is valid for chemispotion.
A. True
B. False

Answer 1

Hint:The curve that expresses any variation in the amount of gas absorbed by the absorbent with pressure at constant pressure is known as Adsorption Isotherm . The adsorption isotherm which gives an empirical relationship between the amount of which is gas adsorbed by a unit mass of the solid adsorbent and pressure at a particular temperature is called the Freundlich Adsorption Isotherm.

Complete step by step solution:
> Freundlich adsorption isotherm, also known as Freundlich equation, shows an empirical relation between the concentrations of a solute on the surface of an adsorbent to the concentration of the solute in the liquid with which it is in contact.
> The Freundlich equation or Freundlich adsorption isotherm is mathematically expressed as
\[\dfrac{x}{m}=K{{p}^{\dfrac{1}{n}}}\]
The other forms of this expression are
\[\log \dfrac{x}{m}=\log K+\dfrac{1}{n}\log p\]
Where x=mass of the adsorbate and m=mass of the adsorbent.
P=Equilibrium pressure of adsorbate.
\[\dfrac{x}{m}=K{{c}^{\dfrac{1}{n}}}\]
\[\log \dfrac{x}{m}=\log K+\dfrac{1}{n}\log c\]
C= Equilibrium concentration of adsorbate in solution.
K and n are constants for a given adsorbate and adsorbent at a given temperature. At high pressure \[\dfrac{1}{n}=0\], so the extent of adsorption becomes independent of pressure.
- Chemisorption is an adsorption which involves chemical reaction between surface and the adsorbent. In contrast with chemisorption is physisorption. Langmuir & BET adsorption isotherm is for physisorption. Langmuir Adsorption is related to monolayer adsorption while Fruendlich adsorption is related to multilayer adsorption.
- Thus we can see that this isotherm is valid for chemisorptions. The above given statement is true.

Note: Freundlich adsorption isotherm is based on chemisorptions. While Langmuir adsorption isotherm is based on physisorption.