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 remaining solution after filtering the crystals is called the mother liquor. It should contain a portion of the original solute (based on its solubility at that temperature) as well as any impurities that were not filtered out. Subsequent harvests of crystals can be obtained from this mother liquor.