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Why is oil unable to dissolve well in water? Water is polar and oil is nonpolar, which means they have no attraction for each other. Oil molecules are too large to fit between the closely spaced water molecules in the liquid state. Water has a greater density than oil, which means that they are not compatible for mixing together. The cohesive properties of water molecules make it difficult for substances like oil to dissolve.

Ralph Lopez

in Chemistry

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Blair Lewis on June 28, 2018

Because water is polar and oil is nonpolar, their molecules are not attracted to one another. The molecules of a polar solvent such as water are attracted to other polar molecules, such as sugar. This explains why sugar has a high solubility in water. Ionic compounds, such as sodium chloride, are also highly soluble in water. Due to the water the molecules are polar, they interact with the sodium and chloride ions. In general, polar solvents dissolve polar solutes and non-polar solvents dissolve solutes non-polar. This concept is often expressed as " dissolves like." So many substances dissolve in water that sometimes is called the universal solvent. The water is considered essential for life because it can carry almost anything that the body needs to take in or need to get rid of.


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