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Chemistry

Twelve Standard >> Emulsions

 
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Colloidal system always has two phases. One is colloid dispersion medium and another is dispersed phase. The collies system where disperse phase and dispersion medium both are liquid is called is called emulsion. Emulsion is classified into two categories. When few drops of oil added to a huge amount of water, it is called oil in water. When few drops of water added to a huge amount of oil, it is called water in oil. Oil & water repair each other. A substance is require to mix oil in water or water in oil. This substance is called emulsifier. Example of emulsifier is soap or detergent(\(C_{17}H_{35}COO^{-}Na^{+}\)). Now (\(C_{17}H_{35}\)) this hydrocarbon is hydrophobic in nature and this (\(COO^{-}Na^{+}\)) is hydrophilic in nature. When soap is mixed with oil and water hydrophilic part attract water & hydrophobic part attract oil as a result mixture of oil and water take place. So emulsifire is required to make emulsion.
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