Question

In Freundlich adsorption isotherm, slope of AB line is : 

• A. n with (n, 0.1 to 0.5)
• B. log n with (n>1)
• C. log 1/n with (n<1)
• D. 1/n with (1/n = 0 to 1)

Hint:

When $1/n = 0$, adsorption is independent of pressure. When $1/n = 1$, adsorption varies linearly with pressure.

Answer 1

The Correct Option is D

Step 1: The Freundlich equation is $\frac{x}{m} = kp^{1/n}$.
Step 2: Taking log on both sides: $\log(\frac{x}{m}) = \log k + \frac{1}{n} \log p$.
Step 3: Comparing with $y = mx + c$, the slope is $\frac{1}{n}$.
Step 4: Experimentally, the value of $\frac{1}{n}$ ranges from 0 to 1.