Why doesn’t fat dissolve in water?



  1. 0 Votes

    Fat is basically oil; oil and water do not mix well unless the water is heated extensively.  This is because water is a polar molecule, which means that its charge is unevenly distributed among its structure.  Oil (or fat), on the other hand, is a nonpolar substance.  The polar water molecule does not attract the nonpolar oil because it tends to attract other polar molecules–usually other water molecules in this case.  Thus, the oil cannot compete for the water’s attraction to itself, and it doesn’t mix.

  2. 0 Votes

    There is an old saying in Chemistry that “like dissolves like.” Put simply, oil molecules are are more attracted to one another than than they are to water molecules, and vice versa. So, it is not that oil and water resist each other, it is that the attraction to their own kind is greater. 

    The reasons for this sort molecular behavior are fairly complex so I won’t go into too much detail. Basically, oil and water to do not attract one another because they are bonded together in different ways, creating differently arranged electrical poles (think of these poles like the two sides of a magnet, positive and negative). The different pole arrangements make oil and water somewhat incompatible, like a square peg in a round hole.


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