Understanding the Incompatibility of Oil and Water: A Scientific Explanation

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SUMMARY

The discussion centers on the scientific explanation for the incompatibility of oil and water, primarily due to differences in polarity. Water molecules exhibit strong intermolecular attractions, which surpass the attraction between water and oil molecules. The introduction of soap, which contains long molecules with dual affinities, facilitates the mixing of oil and water by bridging the gap between the two substances.

PREREQUISITES
  • Understanding of molecular polarity
  • Basic knowledge of intermolecular forces
  • Familiarity with surfactants and their functions
  • Concept of emulsification in chemistry
NEXT STEPS
  • Research the properties of polar and nonpolar molecules
  • Learn about the role of surfactants in emulsification
  • Explore the molecular structure of soap and its interaction with oil and water
  • Investigate other examples of immiscible liquids in chemistry
USEFUL FOR

Students, educators, and anyone interested in chemistry, particularly those studying molecular interactions and the principles of emulsification.

bgq
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Hi,

Why do oil and water not mix? We know that some liquids mix together while others not, I am looking for the reason of this.

Thanks to any replies
 
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Polarity

The attraction between two water molecules is much stronger than the attraction of a water molecule and an oil molecule (or two oil molecules), so they tend to stay together.

You can mix them with soap (as a simplified model, long molecules where one side is attracted by water molecules and the other sticks to oil molecules).
 
Thank you very much.
 

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