Explain the functioning of a soap molecule. [The explanation should be suitable for a 3 to 5 marks answer]
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Soaps are sodium (Na) or potassium ( K) salts of long - chain carboxylic acids.( fig i )
Most dirt are oily in nature , oils does not dissolve in water.
The ionic end of soap dissolves in water and the carbon chain dissolves in oil.
The soap molecules , thus form structures called micelles, where one end of the molecules is towards the oil droplet and the ionic end faces outside.
This forms an emulsion in water.
The soap micelle thus helps in dissolving the dirt in water and we can wash our clothes clean.
After agitation they comes out of clothes and stay in solution as a colloid and will not come together to precipitate because of ion- ion repulsion.
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