Discuss the factors affecting adsorption of gases by solids
admin Factors Affecting Adsorption of Gases by Solids: Almost all the solids adsorb gases to some extent. However, the exact amount of a gas adsorbed depends upon a number of factors,…
Why heat of adsorption is negative? Discuss the free energy change during adsorption.
Adsorption involves attracting molecules of adsorbate on surface of the adsorbent. Due to this, energy is released and thus heat of adsorption is negative i.e. adsorption is always exothermic. Further…
What are the applications of Adsorption?
Adsorption finds extensive applications both in research laboratory and in industry. A few applications are discussed below: In preserving vacuum: In Dewar flasks activated charcoal is placed between the walls…
What is the difference between Lyophilic and Lyophobic Sols?
Differences between lyophilic and lyophobic sols are as follows: PROPERTIES LYOPHILIC SOLS LYOPHOBIC SOLS Ease of preparation Prepared easily by directly mixing with the liquid dispersion medium. Cannot be prepared…
What do you mean by colloidal dispersion? What are its various types?
When some solid is dispersed into a medium in which the solid substance is otherwise insoluble such that after dispersion, the size of the colloidal particles lies in the colloidal…
What do you mean by peptization? What is the cause of peptization? Peptization:
Peptization is a process of passing of a precipitate into colloidal particles on adding suitable electrolyte. The electrolyte added is known as peptizing agent. A few examples of sols obtained…
Discuss the physical properties of Colloidal Solutions.
Physical properties of colloidal solutions: Heterogeneous character: Colloidal particles being larger than molecules form heterogeneous mixture composed of particles of dispersed phase and dispersion medium. The phenomenon of Tyndall effect,…
Give the comparison of multimolecular, macromolecular and associated colloids.
Comparisons of multimolecular, macromolecular and associated colloids are as follows: MULTIMOLECULAR COLLOIDS MACROMOLECULAR COLLOIDS ACCOCIATED COLLOIDS They are formed by the aggregate of a large number of atoms or molecules…
What is the reason for the origin of electrical charge on the colloidal particles?
The various reasons for the origin of electrical charge on the colloidal particles are as follows: Frictional electrification: It is caused by the mutual rubbing of colloidal particles with molecules…
What is Electrophoresis?
The existence of the electrical charge can be shown by the process of ‘Electrophoreses’ which is also known as ‘Cataphoresis’. It involves the movement of colloidal particles towards one or…