Class 12 Chemistry Surface Chemistry Applications of adsorption

Applications of adsorption

  1. Production of high vacuum- Remaining traces of air in a vessel already evacuated by vacuum pump can be adsorbed by charcoal to create high vacuum
  2. Control humidity - Silica and aluminium gels can adsorb moisture and remove humidity
  3. Gas masks- Gas masks consist of activated charcoal or mixture of adsorbents and are used to breathe in coal mines
  4. Removing coloured substances from solutions- This is used in chromatographic analysis.
  5. Separation of inert gases- Different inert gases are adsorbed to different extents on coconut charcoal
  6. Heterogeneous catalysis- When gaseous reactants are adsorbed on the surface of a solid catalyst, the concentration of the reactants on the surface increases and thus, the rate of reaction also increases( adsorption theory). Eg- Using finely divided Nickel in the hydrogenation of vegetable oils
  1. Adsorption indicators- Many dyes have become useful due to adsorption. These dyes have been introduced as indicators especially in precipitation titrations. Eg- KBr is easily titrated with AgNO3 using eosin as the indicator
  1. Froth floatation process- When sulphide ore is shaken with pine oil and water, the ore particles are adsorbed on the froth that floats and the gangue prticles ( like silica, mud) settle down in the tank. This process is used in the concentration of sulphide ores
  2. Chromatographic analysis- The selective adsorption of some substances by a solution helps us separate components of a mixture. Example- All the dyes in ink
  3. Curing Diseases- Some drugs can adsorb the germs on them and hence, kill them saving us from diseases

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