Unsaturated Solution
Definition and meaning of Unsaturated Solution in chemistry.
An unsaturated solution is a solution that contains less dissolved solute than the maximum amount that could dissolve at a given temperature and pressure. It has not yet reached the saturation point.
In more detail
In an unsaturated solution, the concentration of solute is below the saturation point for those specific conditions. If additional solute is added to the solution, it will continue to dissolve until the solution becomes saturated. Unsaturated solutions are contrasted with saturated solutions, which contain the maximum amount of dissolved solute and are in equilibrium with undissolved solute, and with supersaturated solutions, which contain more dissolved solute than should normally be possible at those conditions.
Key facts
| Field | General Chemistry |
|---|---|
| Key characteristic | Concentration below saturation point at a given temperature |
| Common example | NaCl in water |
| Defining property | Can dissolve additional solute without precipitation |
A solution containing 20 grams of table salt (NaCl) dissolved in 100 mL of water at 25 degrees Celsius is unsaturated, since approximately 36 grams of NaCl can dissolve in that volume at that temperature. This means additional salt crystals would dissolve if added to the solution.
Frequently asked questions
How do you know if a solution is unsaturated?
A solution is unsaturated if additional solute will dissolve when added to it at the same temperature and pressure.
What is the difference between an unsaturated and a saturated solution?
An unsaturated solution can still dissolve more solute, while a saturated solution is in equilibrium with undissolved solute and cannot dissolve any additional solute at the given conditions.