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Soap molecules have two dissimilar ends.
i) A hydrocarbon chain end which is non-polar and has no attraction for water.

ii) A carboxylate end which is polar and is attracted to water.

The non-polar end is oil soluble while the polar end is water soluble. Oil and water do not mix (immiscible). When oil is shaken with water, the particles of oil soon coalesce and float on the water surface. Let the soap anion be represented as a match stick structure with a long hydrocarbon chain (non-polar) (hydrophobic) water hating and a polar head (hydrophilic) water loving.

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