Question

Can the adsorption of a solute from a solution be explained on the basis of the Freundlich adsorption isotherm? Explain.

Answer 1

Yes, the adsorption of a solute from a solution can be explained on the basis of the Freundlich adsorption isotherm.

According to this empirical relationship,

`x/m = KC^(1//n)`

Where:

`x/m`​ = Amount of solute adsorbed per unit mass of adsorbent

C = Equilibrium concentration of the solute in solution

K and n = Constants depending on the nature of the adsorbent and solute and the temperature.

Taking the logarithm on both sides:

`log(x/m) = log K + 1/n log C`

This equation is of the form y = mx + c, representing a straight line.

A plot of `log⁡(x/m)` log⁡C gives a straight line.

Slope = `1/n`

Intercept = log K

This confirms the validity of the Freundlich isotherm for solute adsorption from solution.