Question

What is the use of Freundlich adsorption isotherm plot?

Answer 1

Freundlich Adsorption Isotherm

• “Freundlich, in $1909$, gave an empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature.”

Equation given by Freundlich

• The relationship can be expressed as follows:-

$\frac{x}{m}=k{p}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$n$}\right.}\left(n>1\right)$

• Here, $x$ is the mass of the gas adsorbed, and mass $m$ of the adsorbent at pressure $p$.
• $k$ and $n$ are constants that depend on the nature of the adsorbent and the gas at a particular temperature.

Use of Freundlich adsorption isotherm plot

• It is utilized for the low-pressure adsorption of gases by solids.