The Principle of "Like Dissolves Like" The foundational rule governing solubility is "like dissolves like. Energy and Entropy: The Thermodynamic Perspective The separation is not just a matter of preference; it is a thermodynamically driven process.
Understanding the Skin-Like Barrier: Interfacial Tension Between Water and Oil
This creates a kind of "skin" that resists the oil breaking into smaller droplets. For oil to mix with water, energy would be required to break the strong hydrogen bonds between water molecules.
" Polar solvents are effective at dissolving other polar substances because their charges can interact favorably. Water molecules at the surface experience a net inward pull because they are attracted to other water molecules but not to the oil above them.
Understanding the Skin-Like Barrier at the Water and Oil Interface
Oil, on the other hand, is nonpolar. This energy input is not compensated for by the weak van der Waals forces that would form between the water and oil molecules.
More About Why do oil and water not mix
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