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In the Freundlich adsorption isotherm, for moderate pressures, the relationship x/m = kP^(1/n) or log(x/m) = log(k) + (1/n)log(P) is given. Which statement below is accurate?

1. The slope equals 1/n.
2. The slope equals log(k).
3. The slope equals log(P).
4. The slope equals log(x/m).

Correct answer: The slope equals 1/n.

Solution

In the logarithmic form of Freundlich adsorption isotherm, log(x/m) = log(k) + (1/n)log(P), the slope of the straight-line graph is given by the coefficient of log(P), which is 1/n.

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