Explain the mechanism of cleaning action of soaps?
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Answers
Soaps and Detergents consists of a large Hydrocarbon tail with a positively charged head. The Hydrocarbon tail is negetively charged and water repelling (Hydrophobic) and the positive cahrged is water loving (Hydrophilic).
Inside water the soap molecule forms a cluster called micelle in which the Hydrophobic tail is in the interior of the cluster and the hydrophilic (ionised) part is on the surface of the cluster. The oily dirt will be collected in the centre of the micelle. The micelle will not form precipitate by coming together and due to ion - ion repulsion, the suspended dirt particles can be easily washed off.
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Cleansing action of soaps:
The dirt present on clothes is organic in nature and insoluble in water. Therefore, it cannot be removed by only washing with water. When soap is dissolved in water, its hydrophobic ends attach themselves to the dirt and remove it from the cloth. Then, the molecules of soap arrange themselves in micelle formation and trap the dirt at the centre of the cluster. These micelles remain suspended in the water. Hence, the dust particles are easily rinsed away by water.