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What are Emulsions? Video Lecture | Chemistry Class 12 - NEET

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1. What are emulsions?
Ans. Emulsions are a type of colloidal dispersion consisting of two immiscible liquids, typically oil and water, where one liquid is dispersed in the form of small droplets throughout the other liquid. They are stabilized by the presence of an emulsifying agent or surfactant.
2. How are emulsions formed?
Ans. Emulsions are formed by vigorously mixing the two immiscible liquids together, along with an emulsifying agent. The emulsifying agent helps to reduce the interfacial tension between the two liquids, allowing them to mix and form stable droplets.
3. What are the applications of emulsions?
Ans. Emulsions find a wide range of applications in various industries. They are commonly used in food and beverage products, such as salad dressings, mayonnaise, and ice cream. They are also used in cosmetics, pharmaceuticals, and in the production of paints, lubricants, and many other products.
4. How are emulsions stabilized?
Ans. Emulsions are stabilized by the presence of emulsifying agents or surfactants. These molecules have both hydrophilic (water-loving) and hydrophobic (oil-loving) components. The hydrophilic part of the emulsifier molecule attaches to the water phase, while the hydrophobic part attaches to the oil phase, creating a stable interface between the two liquids.
5. What factors can affect the stability of emulsions?
Ans. Several factors can affect the stability of emulsions. These include the type and concentration of emulsifier used, the ratio of oil to water, the temperature, and the presence of any additives or contaminants. Additionally, the method of preparation, such as the mixing technique or the use of high-pressure homogenization, can also influence the stability of emulsions.
101 videos|287 docs|123 tests
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