How is take test for aluminium ion based upon adsorption ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Lake Test**: The lake test is a qualitative analysis method used to detect the presence of aluminum ions (Al³⁺) in a solution. This test is based on the principle of adsorption.

2. **Principle of Adsorption**: Adsorption is the process where molecules adhere to the surface of a solid. In the case of the lake test, aluminum ions will adsorb onto the surface of a solid, which is typically aluminum hydroxide (Al(OH)₃).

3. **Preparation of Aluminum Hydroxide**: To perform the lake test, aluminum ions are first precipitated out of the solution by adding aqueous ammonia (NH₄OH). This leads to the formation of aluminum hydroxide, which is a solid.

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