12th Class Chemistry Chemistry in Everyday Life

  • question_answer 30) Explain the cleansing action of soaps. 

    Answer:

    Soap molecule can be represented as     Hydrocarbon chain is water repelling and ionic part is water attracting.When soap is dissolved in water and a dirty cloth is agitated in thesolution, the oily dirt attaches to the hydrocarbon part while waterattaches to the ionic part. Now these soap molecules arrange themselves in the form of micelles. As the mixture is agitated more, the more and more dirt particles leavethe cloth and get attached to the soap molecules. The negative chargesof micelles prevent the dirt to form aggregates. Thus, soap removes dirtby reducing the surface tension of water.    

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