Recall: The theory of like dissolves like states that compounds with similar intermolecular forces or polarity dissolve each other. The types of intermolecular forces possible are:

– Ion-dipole interaction: the strongest type; occurs between ions from ionic compounds and dipole moments from polar covalent compounds.
– Hydrogen bonding: occurs when H is bonded to an electronegative atom such as N, O, F.
– Dipole-dipole interaction: occurs between polar covalent compounds.
– London dispersion forces: the weakest type; occurs between nonpolar covalent compounds.