Chapter Name: Separation of Substances
Activity Name: Sedimentation and decantation in Separation of Substances
The experiment involves observing the process of sedimentation and decantation using a mixture of soil and water. The sedimentation process separates the sand and mud particles from the soil, causing them to settle at the bottom of a glass tumbler.
The decantation process involves gently lifting the tumbler and allowing the water to separate from the sediment without disturbing it.
- Glass tumbler
- Another tumbler
Step by Step Procedure:
- Take a glass tumbler and fill it halfway with a mixture of soil and water.
- Stir the mixture gently to ensure the soil particles are well dispersed in the water.
- Keep the glass tumbler undisturbed for some time.
- Observe that the sand and mud particles in the soil settle down at the bottom of the tumbler. These settled particles are called sediments.
- Gently lift the tumbler, tilting it slightly so that the tip of the tumbler rests on the edge of another tumbler.
- Allow the water to separate from the sediment without disturbing it. This process is called decantation.
- The sand and mud particles in the soil settle down at the bottom of the glass tumbler during sedimentation.
- When the tumbler is lifted and inclined, the water separates from the sediment through the process of decantation.
- Handle the glassware with care to avoid any breakage or injuries.
- Use a clean glass tumbler and ensure the soil and water are free from any contaminants.
Lesson Learnt from Experiment:
The experiment demonstrates the process of sedimentation and decantation. Sedimentation refers to the settling of particles at the bottom of a liquid due to gravity, while decantation is the separation of a liquid from the settled particles.
These processes are commonly used at home while cleaning rice and pulses for cooking, as mentioned by Laxmi.