Name: Methods for Coagulation of Colloidal Solutions
Uploaded: 2019-07-19
Duration: 12 min 36 s
Description: Coagulation is the destabilisation of colloids by neutralising the electric charge of the dispersed phase particles. Watch this video to learn the methods of...

Question

Describe factors affecting adsorption of gases on solids.

Accepted Answer

The exact amount of a gas adsorbed at the surface of a solid depends upon the following factors:
(i) Nature of gas (adsorbate):
If critical temperature of gas is higher, the van der Waal’s forces of attraction will be greater so adsorption will be greater. Critical temperatures of a few gases are given below:

Gas $H_{2}$ $N_{2}$ $CO$ ${CH}_{4}$ ${CO}_{2}$

Critical Temperature K 33 126 134 190 304

(ii) Nature of solid (adsorbent):
Greater the surface area per unit mass of the solid, greater is the extent of adsorption.
(iii) Effect of temperature:
Adsorption is accompanied by evolution of heat. According to Le-Chateliers’s principle, the rate of adsorption decreases with increase in temperature.
(iv) Effect of pressure:
At constant temperature, adsorption increases with pressure. If the temperature is kept constant at low value, the effect will be large.

Describe factors affecting adsorption of gases on solids.

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