Question

Why we can't dissolve a non polar compound in a polar solvent or vice versa ?

Answer 1

In the case of a substance such as water dissolving methane, the problem is that in order for water to bond to methane it must break bonds to other water molecules first. Since a polar water molecule binds to another polar water molecule more strongly than it binds to non-polar methane, the water molecules will stay bound to each other and "push out" the methane for the most part. In the case of polar molecules such as NaCl, water can bind very strongly to either Na+ or Cl- and this strong interaction allows some water molecules to overcome the bonds to other water molecules to form new bonds surrounding these polar ions.

Answer 2

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