: How can a saturated solution be made from the liquid from the eye dropper?

Add solute to a liquid until no more will dissolve. Solubility often increases with temperature, so you may be able to get more solute into a hot solvent than you would if the solvent was cool. For example, you can dissolve much more sugar in hot water than you can in cold water.
Evaporate solvent from an unsaturated solution. You can evaporate the solvent by permitting air circulation or by heating the solvent.
Add a seed crystal to a supersaturated solution. The seed crystal will cause the solute to precipitate, leaving a saturated solution.