A solute is a substance dissolved in a solvent. Solutes cannot be seen inside their solvents, which makes it impossible to separate them mechanically. Generally, solutions are stable under certain conditions. That means that they do not require stirring. A stable solution can be liquid, gaseous, or solid.
A saturated solution of solute and solvent is a mixture containing the maximum solute amount. More solute can no longer be added to the solution, resulting in a solid precipitate or gas release. As a result, a saturated solution is unstable.
Saturated solutions can be unstable, as they contain more solute than they can dissolve. They are unstable and can re-crystallize when a seed crystal is added to it. These solutions are often formed as a result of a chemical reaction. However, it is possible to make a supersaturated solution with a small amount of seed crystal.
The concentration of a solute in a saturated solution is commonly expressed in terms of mass or volume or as the amount of solute in a given volume of solvent. In other cases, the concentration of the solute is expressed in terms of moles instead of mass. In the latter case, the solute content in the solution is expressed in terms of moles per litre of solvent.
Solubility increases with increasing temperature. At a higher temperature, the dissolution rate is faster than crystallization. When a solution becomes saturated, a seed crystal is added to it, which restores dynamic equilibrium. Once the seed crystal is added, the net amount of dissolved solute is unchanged.