Preparation of saturated and unsaturated solutions in Is Matter Pure – Class 9 Science Experiment

Chapter Name: Is Matter Pure

Activity Name: Preparation of saturated and unsaturated solutions in Is Matter Pure

Activity Description:

Required Items:

1. Water
2. Sugar
3. Empty cup
4. Stirring rod
5. Beaker

Step by Step Procedure:

1. Take 50 ml of water in an empty cup.
2. Add one spoon of sugar to the water in the cup and stir it until it is completely dissolved.
3. Continue adding sugar to the cup, one spoon at a time, and keep stirring until no more sugar can be dissolved in the water. Note the number of spoons of sugar added until saturation is reached.
4. Record the observation of the maximum amount of sugar that could be dissolved in the water at the given temperature. This solution is a saturated solution.
5. To prepare an unsaturated solution, take the saturated solution into a beaker and heat it slowly (do not boil).
6. While heating, add some more sugar to the solution and observe that the heated solution allows dissolving more sugar in it easily.

Experiment Observations:

1. Number of spoons of sugar added until saturation is reached.
2. Maximum amount of sugar that could be dissolved in the water at the given temperature.

Precautions:

• Stir the solution gently to avoid splashing or spillage.
• Avoid overheating the solution to prevent boiling.
• Use a clean and dry spoon for adding sugar to the solution.
• Record the observations accurately.

Lesson Learnt from Experiment:

Through this experiment, students will learn the concept of solubility and saturation in solutions. They will understand that a saturated solution cannot dissolve any more solute at a certain temperature, while an unsaturated solution has not reached its maximum solute-dissolving capacity. Heating the saturated solution increases its capacity to dissolve more solute.