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Questions
Explain that adsorption is a surface phenomenon.
Explain the meaning of the statement, “Adsorption is a surface phenomenon.”
Why is adsorption regarded as a surface phenomenon?
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Solution
Consider the surface of a liquid or a solid.
- The molecular forces at the surface of a liquid are unbalanced or in an unsaturated 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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