Answer: The chemicals that cannot be distilled are called non-volatile solutes. These are substances that do not evaporate at the boiling point of the solvent, which is typically water. Therefore, when a solution containing a non-volatile solute is heated to boil, the solvent evaporates leaving behind the solute. Distillation is not effective at removing non-volatile solutes because the solute remains in the boiling flask and does not evaporate with the solvent and can be condensed back into liquid form.
Step-by-step explanation: