Ncert Exercises & Solutions

The correct curve for Freundlich's adsorption isotherm is:

1.		2.
3.		4.

HINT:

\frac{x}{m} = k p^{1 / n}

$\frac{x}{m} = k p^{1 / n}$

Explanation:

According to the Freundlich adsorption isotherm:

\frac{x}{m} = {kp}^{1 / n}

$\frac{x}{m} = {kp}^{1 / n}$

Taking log on both sides

\log \frac{x}{m} = (\frac{1}{n}) \log p + lo g k

$\log \frac{x}{m} = (\frac{1}{n}) \log p + lo g k$

\overset{↑}{Y} = \overset{↑}{m} \overset{↑}{x} + \overset{↑}{C}

$\overset{↑}{Y} = \overset{↑}{m} \overset{↑}{x} + \overset{↑}{C}$

On comparing it with the equation of a straight line and drawing the graph log

\frac{x}{m}

$\frac{x}{m}$ versus log

p

, we get a straight line with intercept log, and slope of the straight line gives the value of

\frac{1}{n}