Why oil does not dissolve in water
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Because water is polar and oil is nonpolar, their molecules are notattracted to each other. The molecules of a polar solvent like water areattracted to other polar molecules, such as those of sugar. This explainswhy sugar has such a high solubility in water. Ionic compounds, suchas sodium chloride, are also highly soluble in water. Because watermolecules are polar, they interact with the sodium and chloride ions.In general, polar solvents dissolve polar solutes, and nonpolar solventsdissolve nonpolar solutes. This concept is often expressed as “Likedissolves like.”
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Liquid water is held together by hydrogen bonds. Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water's hydrogen bonds. ... Water will not do this so the oil is forced to stay separate from the water.
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