Question
Distinguish between the following : Adsorption and absorption. Give one example.
✓
Answer
Adsorption:
- Adsorption is a surface phenomenon as adsorbed matter is concentrated only at the surface and does not penetrate through the surface to the bulk of adsorbent.
- Concentration of the adsorbate is high only at the surface of the adsorbent.
- It is dependent on temperature and pressure.
- It is accompanied by evolution of heat known as heat of adsorption.
- It depends on surface area.
e.g. Adsoiption of a gas or liquid like acetic acid by activated charcoal.
Absorption:
- Absorption is a bulk phenomenon as absorbed matter is uniformly distributed inside as well as at the surface of the bulk of substance.
- Concentration of the absorbate is uniform throughout the bulk of the absorbent.
- It is independent of temperature and pressure.
- It may or may not be accompanied by any evolution or absorption of heat.
- It is independent of surface area.
e.g. Absorption of water by cotton, absorption of ink by blotting paper.
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