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Question
Explain the Adsorption is a surface phenomenon.
Solution
Consider the surface of a liquid or a solid.
- The molecular forces at the surface of a liquid are unbalanced or in an unsaturation state.
- In solids, the ions or molecules at the surface of a crystal do not have their forces satisfied by close contact with other particles.
- Because of the unsaturation, solid and liquid surfaces tend to attract gases or dissolved substances with which they come in close contact. Thus, the substance accumulates on the surface of a solid or liquid i.e., the substance gets adsorbed on the surface. Hence, adsorption is a surface phenomenon.
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