# Freundlich Adsorption Isotherm

**Freundlich Adsorption Isotherm**:

According to him:

(i) **At low pressure:**

At low pressure the graph is almost

Straight. i.e.

Where, K = constant

(ii) **At high pressure**:

x / m becomes almost constant and does not change with pressure

(iii) ** At intermediate value of pressure.**

Here,

…..(1)

Here ‘n’ is a constant depending upon nature of adsorbate and adsorbent.

The value of K, n can be determined as follows: On taking logarithm of equation (1) we get

Thus, on plotting a graph between x/ m and log_{e}p a straight line is obtained.

Here,

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