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What is the difference between a colloid...

What is the difference between a colloidal solution and emulsion? What is the role of emulsifier in forming emulsion?

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Colloidal solution These are the solutions in which the diameter of dispersed phase particles may range from 1 to 100 nm. These are intermediate of true solutions and suspensions. The colloidal particles do not settle down under the force of gravity even on long standing. A colloid is a heterogeneous system, e.g. gold sol, sulphur sol, soap, etc.
While Emulsions are one of the types of colloidal system, in which both the dispersed phase and dispersion medium are liquids, e.g. milk.
Role of emulsifier Emulsifying agents are added to emulsions to stabilise them. The emulsifying agent forms an interfacial film between suspended particles and the medium. For example oil in water type emulsions, the principal emulsifying agents are gums, proteins, natural and synthetic soaps.
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