Colloidal solution is a homogeneous system of two immiscible phases. It means that colloids are now regarded as systems in which there are two or more phases, with one (is called the dispersed phase) distributed in the other (the continuous phase).
There are various types of colloidal solutions. Solution is called a colloidal solution. Solution are of two types:
i. Lyophobic Solution: In these sols there is no affinity between
the dispersed phase and the liquid.
ii. Lyophilic Solution: These are more like true solutions in
which the solute molecules are large and have an
affinity.
Applications of Colloidal Solution:
1. In Medicine: Oral medicines are taken in colloidal form because they are more effective in this state. Colloidal gold, colloidal silver, colloidal calcium, colloidal manganese, etc. are used to increase the vitality of our body. Colloidal sulphur is used as a germicide
2. Cleansing of Clothes: Soaps and detergents are used to clean dirty clothes. They remove dirt by
converting and precipitating them as colloidal particles.
3. Use of Gas Masks: Use of gas masks depends on the absorption property of charcoal.
4. In making of inks, dyes and paints etc. ink, dyes and paints are colloidal substances.
5. Purification of Water: When potash alum is added to muddy water, the colloidal muddy particles get coagulated and they precipitate out and settle down at the bottom making water clean and pure.
6. Smoke Precipitation: Smoke is a colloidal solution of carbon in air. They are charged particles and hence they can be precipitated on charged metal plates.
7. Sewage Disposal: Disposal of sewage is based on
the phenomenon of cataphoresis.
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