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Grade: 12
        
explain the phenomena of adsorption
and difference between adsorption and absorbtion
4 years ago

Answers : (1)

Ashutosh Sharma
askIITians Faculty
181 Points
							Adsorption is the phenomenon of accumulation of large number of molecular species at the surface of liquid or solid phase in comparison to the bulk.
The process of adsorption arises due to presence of unbalanced or residual forces at the surface of liquid or solid phase. These unbalanced residual forces have tendency to attract and retain the molecular species with which it comes in contact with the surface. Adsorption is essentially a surface phenomenon.
Adsorption is a spontaneous and exothermic process and it is of two type.
1.Physical Adsorption or Physisorption
2.Chemical Adsorption or Chemisorption

Absorption
Definition-Assimilation of molecular species throughout the bulk of the solid or liquid is termed as absorption.
Phenomenon-It is a bulk phenomenon.
Heat exchange-Endothermic process.
Temperature-It is not affected by temperature.
Rate of reaction-It occurs at a uniform rate.
Concentration-It is same throughout the material.

Adsorption
Definition- Accumulation of the molecular species at the surface rather than in the bulk of the solid or liquid is termed as adsorption.
Phenomenon-It is a surface phenomenon.
Heat exchange-Exothermic process
Temperature- It is favoured by low temperature
Rate of reaction- It steadily increases and reach to equilibrium
Concentration-Concentration on the surface of adsorbent is different from that in the bulk.
4 years ago
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