CBSE Class 9 Science Pratical: Preparation of a Suspension of Soil, Chalk Powder and Fine Sand in Water

Experiment: Preparation and Study of Suspensions

Aim

To prepare a suspension of soil, chalk powder, and fine sand in water and study their behavior.

Materials Required

• Three clean glass beakers or test tubes
• Water
• Soil
• Chalk powder
• Fine sand
• Glass rod or spoon

Procedure

A. Suspension of Soil in Water

1. Take a clean beaker and fill it half with water.
2. Add a small amount of soil to the water.
3. Stir the mixture well using a glass rod.
4. Leave the mixture undisturbed for some time.

B. Suspension of Chalk Powder in Water

1. Take another beaker and add water to it.
2. Add a small quantity of chalk powder.
3. Stir the mixture thoroughly.
4. Allow it to stand for some time.

C. Suspension of Fine Sand in Water

1. Take a third beaker and pour water into it.
2. Add fine sand slowly.
3. Stir well and then keep the beaker undisturbed.

Observation

• The particles of soil, chalk powder, and fine sand are visible to the naked eye.
• After some time, the particles settle down at the bottom of the beaker.
• The mixture becomes clearer at the top.
• The particles can be separated by filtration.

Result / Conclusion

• Soil, chalk powder, and fine sand do not dissolve in water.
• They form suspensions.
• A suspension is a heterogeneous mixture.
• Suspended particles are unstable and settle on standing.