Question

cleaning action of soap...for 5 marks ​

Answer 1

Answer:

Layers from the dirty surface are converted into small globules. A stable emulsion of oil in water is formed. The emulsified oil globules consisting of dirt can be readily washed with water. Thus, soap cleans the dirt from clothes or skin by forming micelles.

Answer 2

Hi Mate,

The dirt is generally held to the surface of a dirty cloth by a thin film of oil or grease. When a dirty cloth is treated with soap or detergent solution, the nonpolar hydrocarbon Tales of the soap or detergent dissolve in oil or grease while the polar heads are held by the surrounding water. As a result, soap or detergent micelles are formed with the oily or greasy dirt lying on the centres. In other words, soap or the detergent is attracted both by the greasy dirt and water. This lowers the surface tension of water and a stable emulsion of oil and water is formed.

When the surface of the cloth is mechanically scrubbed or beaten on a stone or with a wooden paddle or agitated in a washing machine, the loosened and oily dirt particles are removed from the dirty surface and the cloth is cleaned.

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