Solubility solvent predictors

Comparing polarity between components is often a good way to predict solubility, regardless of whether those components are liquid, solid, or gas. Why is polarity such a good predictor Because polarity is central to the tournament of forces that underlies solubility. So solids held together by ionic bonds (the most polar type of bond) or polar covalent bonds tend to dissolve well in polar solvents, like water. 

Hildebrand s solubility parameter 8 = [Av//° - ///]/ V)1/2 is a useful guide for the solubility of nonpolar solutes in nonpolar solvents, but a poor predictor for solubilities in water. In general, the more polar a solvent, or solute, the better it dissolves in water, but again, there is no clear relationship between any... 

---