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…
Coagulation: Coagulation is a process which involves coming together of colloidal particles so as to change into large sized particles which ultimately settle as a precipitate or float on the…
Coagulation can be caused by the following methods: By electrophoresis: In electrophoresis, the particles of dispersed phase move towards oppositely charged electrode and get neutralized. If the process is continued…
Lyophobic sols are unstable and are easily precipitated by the addition of electrolytes. However it is observed that the addition of certain lyophilic colloids like gums, soaps, gelatin etc. To…
An emulsion is colloidal dispersion in which both the dispersed phase and the dispersion medium are liquids. The two well known examples of emulsions are: 1) Milk in which the…
Various methods of emulsions to test the type of emulsion are as follows: a) Microscopic methods: To a small amount of the given emulsion, a few drops of water are…
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