Now suppose we wanted to make a solution out of compound X and Y. So we mix them. What would have to happen before a solution is formed? So by definition, we said solution formation is a formation of intermolecular bonds between X and Y. Well, before a bond is formed between X and Y, the bonds between the XS and the YS must break. So before X and Y forms a solution, intermolecular bonds between compound X and intermolecular bonds between compound Y must break.