Give the expression of Freundlich isotherms.

Explanation

To provide a step-by-step solution to the question regarding the expression of the Freundlich isotherm, we will break down the components of the isotherm and its expression.

### Step-by-Step Solution:

1. **Understanding the Freundlich Isotherm**:
The Freundlich isotherm is an empirical relationship that describes how solutes distribute between the liquid and solid phases when adsorbed onto a surface. It is particularly applicable for heterogeneous surfaces.

2. **Expression of the Freundlich Isotherm**:
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