The three solutes, acid, base and neutral, could be extracted using different solvents and could then be further purified using the recrystallization technique. However, they were not completely extracted, because the percentage yields were only 38.5%, 37.9%, and 40.0% for the acidic, basic, and neutral solutes, respectively. Since only about 40% of each solute was extracted, this means that the remainder was left in the other extraction steps or was not crystallized from solution during recrystallization. This could be due to incomplete extraction of extraction solutions during the extraction procedure or incomplete cooling during recrystallization. However, overall, the expected principles were