the solvents that are used to combine together to make the solvent pair should be miscible. Hexane is nonpolar solvent, while water is a polar solvent. Thus, they are not miscible and will stay as two layers after they are combined together. Thus, they cannot work together as a solvent pair in recrystallization Solution the solvents that are used to combine together to make the solvent pair should be miscible. Hexane is nonpolar solvent, while water is a polar solvent. Thus, they are not miscible and will stay as two layers after they are combined together. Thus, they cannot work together as a solvent pair in recrystallization.