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Colloid Properties: Coagulation Lyophilic (Part - 27) - Surface Chemistry, Chemistry, Class 12 Video Lecture

FAQs on Colloid Properties: Coagulation Lyophilic (Part - 27) - Surface Chemistry, Chemistry, Class 12 Video Lecture

1. What are the properties of colloids?

Ans. Colloids have several distinctive properties. They exhibit the Tyndall effect, which means that they scatter light when a beam of light is passed through them. Colloids also have a large surface area to volume ratio, which makes them highly reactive. They do not settle down due to gravity, and they can be separated by techniques like centrifugation. Moreover, colloids can undergo coagulation or precipitation upon the addition of suitable reagents.

2. What is coagulation in colloids?

Ans. Coagulation, also known as flocculation, is the process of destabilizing and clumping together of colloidal particles, causing the formation of aggregates or flocs. This process results in the separation of the dispersed phase from the dispersion medium, leading to the sedimentation or precipitation of the colloidal particles. Coagulation can be induced by various factors such as the addition of electrolytes, change in pH, or thermal energy.

3. What is lyophilic colloid?

Ans. Lyophilic colloids, also known as reversible or solvent-loving colloids, are colloidal systems in which the dispersed phase has a strong affinity for the dispersion medium. These colloids are formed by substances such as gelatin, starch, and gum, which readily dissolve or disperse in the solvent. Lyophilic colloids are stable and do not undergo coagulation easily. They form a reversible sol-gel transition, where the sol can be converted into a gel by changing the conditions.

4. How does coagulation occur in lyophilic colloids?

Ans. Coagulation in lyophilic colloids is not spontaneous and requires the addition of certain reagents or external factors. The stability of lyophilic colloids is due to the presence of a protective layer of solvent molecules adsorbed on the surface of the dispersed particles. Coagulation can be induced by the addition of electrolytes, which neutralize the charge on the colloidal particles and reduce the repulsive forces between them. This leads to the formation of aggregates or flocs, causing coagulation.

5. What is the significance of coagulation in colloids?

Ans. Coagulation plays a crucial role in various industrial and biological processes. In water treatment, coagulation is used to remove suspended impurities and turbidity by destabilizing colloidal particles and facilitating their sedimentation or filtration. It is also employed in the production of cheese, where coagulation helps in the separation of curd from milk. Coagulation is significant in the field of medicine as well, as it is utilized in blood clotting and the formation of thrombi to prevent excessive bleeding.

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