Experiment: Make Saturated and Unsaturated Solutions - QS Study

Task: To make saturated and unsaturated solutions.

Required accessories: One beaker, measuring flask, stirrer, salt and water.

Procedure: Clean the beaker by it washing well. Use the measuring flask to take 100 milliliters of water in the beaker. Now keep adding salt in little amounts to the water and stir. In this way continue to add salt and stir until the added salt does not dissolve anymore despite rigorous stirring.

Analysis:

A saturated solution is when the solute can dissolve in the solvent. For example, if you have a bottle of water and you pour lemonade crystals into the water, and it dissolves, the solution is saturated. An unsaturated solution is when the solute cannot dissolve into the solvent. For example, if you have a glass of water, and you pour something like vegetable oil into it, it will not dissolve. So that makes the solution unsaturated

In course of adding salt in little chunks, why, at a certain stage, the salt does not dissolve despite constant stirring? The cause is, in the process of adding salt at regular intervals, the solution has become saturated. This is a state when the solvent (water) is unable to dissolve any more solute (salt). So, in a certain temperature if the maximum amount of solute that can be dissolved by a certain amount of solvent is dissolved by the solvent, then the solution obtained is called saturated solution.

On the other hand, in a solution if the amount of solute dissolved is less than the maximum amount of solute the solvent can dissolve, that solution will be unsaturated solution.

In the above events the solution obtained in all the phases before the last chunk of added salt that remained undisclosed are examples of unsaturated solution. In a saturated solution a little amount of the solute will not be dissolve in spite of much stirring. On the other hand, in a unsaturated solution, the added solute will continue to dissolve due to stirring till the solution convert into saturated solution.