The remaining solution, once the crystals have been filtered out, is known as the mother liquor, and will contain a portion of the original solute (as predicted by its solubility at that temperature) as well as any impurities that were not filtered out. Second and third crops of crystals can then be harvested from the mother liquor.
The solution left after filtering the crystals is referred to as the mother liquor. It will contain a portion of the original solute (as predicted by its solubility at that temperature) and any impurities not filtered out. Additional crystal harvests can then be extracted from this mother liquor.