Adsorption
What is Adsorption? The phenomenon of adsorption was introduced by Scheele during the discovery of uptake of gases by charcoal.The term adsorption was given by Kayser and this concept of adsorption was developed by Kayser and Raymonds.When a solid surface is exposed to a gas or a liquid, molecules from the gas or liquid accumulates at […]
What is Adsorption? 
  • The phenomenon of adsorption was introduced by Scheele during the discovery of uptake of gases by charcoal.
  • The term adsorption was given by Kayser and this concept of adsorption was developed by Kayser and Raymonds.
  • When a solid surface is exposed to a gas or a liquid, molecules from the gas or liquid accumulates at the surface. The phenomenon of concentration of a gas or a liquid at a solid surface rather than in its bulk is called Adsorption.
  • Adsorption is caused by a type of Vanderwall's force which exists between the molecule known as London Dispersion Force
  • The substance that concentrates at the surface is called adsorbate and the solid at the surface of which the concentration occurs is called adsorbent.
Example of Adsorption:
    • Finely divided charcoal if stirred into a dilute solution of methylene blue, the dye molecule are adsorbed by the charcoal particles and the depth of color of the solution decreases appreciably.
    • If gas like SO2 , Cl2 , NH3S is treated with powdered charcoal in a closed vessel, the gas molecule adsorbed on the charcoal surface and the gas pressure is reduced.
    • The common adsorbents are charcoal(vegetable and animal),  silica gel(prepared by heating a mixture of sodium silicate and 10% HCl at 50-degree centigrade), a metal such as Ni, Cu, Ag, Au, Pt, and colloids.

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