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…
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…
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…
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…
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…
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,…
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…
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…
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…
On placing a colloidal solution under the influence of an electric field, the particles of the dispersion medium move towards oppositely charged, provided the colloidal particles are not allowed to…
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