Question

For adsorption of a gas on a solid ,the plot of log x/m vs log P is linear with slope equal to :(n being whole number)

• A. k
• B. log k
• C. n
• D. 1/n

Answer 1

Answer: (D)

1/n

Answer 2

If we plot a graph between log $\frac{ X}{m}$ and log p, a straight line will be obtained. The slope of the line is equal to $\frac{1}{n}$ and the intercept is equal to log k. where, $\frac{ X}{m}$ = amount of adsorption .According to Freundlich adsorption isotherm $\frac{ X}{m} = k p^{1/n}$ $m= \frac{1}{n} (slope)$ Taking log of both sides, $log \frac{ X}{m} = log k + \frac{1}{n} log p$ from $\, \, \, y = mx +c$