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# Action of soap is due to emulsification and micelle formation. Comment.

5.18         Action of soap is due to emulsification and micelle formation. Comment.

The cleansing action of soap is because of emulsification and micelle formation. Soaps are sodium or potassium salts of long chain fatty acids, represented as $RCOO^{-}Na^{+}$ (e.g. sodium stearate $CH_{3}(CH_{2})_{16}COO^{-}Na^{+}$). when dissolved into the water it dissociates into $RCOO^{-}$ and $Na^{+}$ ions. $(RCOO^{-}Na^{+}\rightleftharpoons RCOO^{-}+Na^{+})$. The long carbon chains are non-polar in nature (hydrophobic) and $COO^{-}$ are polar in nature (hydrophilic part).