Answer:
If you heat a solution and remove water through evaporation, it is possible that crystals may form at the bottom of the container. This occurs because as water is removed from the solution, the concentration of dissolved solute in the remaining solution increases. If the concentration becomes greater than the solubility limit of the solute at the current temperature, then excess solute will begin to precipitate out of the solution in the form of crystals.
The formation of crystals is a physical change that occurs when a supersaturated solution becomes saturated and can no longer hold all of the solute molecules in solution. The excess solute molecules then aggregate together to form solid crystals, which can settle at the bottom of the container due to their greater density compared to the remaining solution.
Overall, the formation of crystals during the evaporation of a solution is a common occurrence in many chemical and physical processes, and is often used to purify or isolate specific compounds or substances.