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Question

Does the chemical adsorption increase or decrease when the surface area of the adsorbent increases?


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Solution

Part 1: Adsorption: In adsorption, the substance whose molecules get adsorbed at the surface is called the adsorbate. The substance on whose surface the process takes place is called the adsorbent.

  • Adsorbate: Substance that is deposited on the surface of another substance. For example, H2, N2 and O2 gases.
  • Adsorbent: Surface of a substance on which adsorbate adsorbs. For example, Charcoal, Silica gel, and alumina.

Part 2: Chemical adsorption :

Chemical adsorption occurs when the adsorbate molecule is held on the adsorbent surface by chemical forces as short covalent chemical bonding occurs by sharing electrons.

Characteristics of chemical adsorption:

  1. This type of adsorption is caused by chemical forces.
  2. It is a very strong process.
  3. This type of adsorption is almost a single-layered phenomenon.
  4. Chemisorption is highly specific and takes place at reaction centres on the adsorbent.
  5. Surface area, temperature, and nature of adsorbate effects chemisorption.
  • With the increase in surface area of adsorbent, chemical adsorption increases.
  • If the adsorbent surface is more fine or rough, the surface area will be greater.
  • This is because when we increase the surface area there is more number of adsorbing sites, hence the adsorption will be greater.

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