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Write the characteristics of adsorption. |
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Answer» Solution :Characteristics of adsorption : (i) Adsorption can occur in all interfacial SURFACES i.e. the adsorption can occur in between gas-solid, LIQUID -solid, liquid -liquid, solid- solid and gas-liquid. (ii) Adsorption is always accompanied by decrease in FREE energy. When `DeltaG` reaches zero, the equilibrium is attained. (iii) Adsorption is a spontaneous process. (IV) When molecules are adsorbed, there is always a decrease in randomness of the molecules. We know, `DeltaG = DeltaH - T Delta S ` where `DeltaG`is Change in Free energy. `DeltaH` is Change in enthalpy and `DeltaS` - Change in entropy. Hence, `DeltaH = Delta G + T Delta S` . (v)Adsorption is EXOTHERMIC as there is an interaction between adsorbate and adsorbent. |
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