* Solubility: Salt dissolves in water because the water molecules surround the salt ions, breaking the ionic bonds and keeping them in solution.
* Evaporation: When water evaporates, the water molecules leave the solution, leaving the salt ions behind.
* Crystallization: As more water evaporates, the concentration of salt ions increases. Eventually, the solution becomes saturated, meaning it can't hold any more dissolved salt. At this point, the salt ions start to re-form their ionic bonds and crystallize out of the solution, forming solid salt crystals.
In short: The salt in solution doesn't disappear when the water evaporates. It remains behind, either dissolved in the remaining water or as solid crystals.
