2. Separation by Centrifugation
If we have a mixture of fine suspended particles in a liquid,we can separate it by the process of filtration by using a filter paper.This process is,however,very slow.But we can separate the suspended particles of a substance in a liquid very rapidly by using the method of centrifugation.Centrifugation is done by using a machine called centrifuge. We can now say that: Centrifugation is a method for separating the suspended particles of a substance from a liquid in which the mixture is rotated (or spun) at a high speed in a centrifuge.
In the method of centrifugation, the mixture of fine suspended particles in a liquid is taken in a test-tube (called centrifuge tube). The test-tube is placed in a centrifuge machine and rotated rapidly for some time. As the mixture rotates round rapidly, a force acts on the heavier suspended particles in it and brings them down to the bottom of the test-tube. The clear liquid, being lighter, remains on top (see Figure 69). We can separate the clay particles suspended in water very rapidly by the method of centrifugation. The suspension of clay particles in water is taken in a test-tube and rotated very fast in a centrifuge machine.The clay particles settle down at the bottom of the test-tube and clear water remains at the top. They can now be separated by decantation.
Notes
Matter in Our Surroundings - Notes
1. The Case of a Liquid Solute Dissolved in a Liquid Solvent
Show Notes
2. 11. Metals Usually Have a Silver or Grey Colour
Show Notes
5. 3. Non-Metals are Bad Conductors of Heat and Electricity.
Show Notes
9. To Study the Properties of a Colloid
Show Notes
12. 7. Non-Metals may be Solid, Liquid or Gases at the Room Temperature.
Show Notes
14. Separation Of Mixture Of a Solid And a Liquids
Show Notes
15. 1. Separation by a Suitable Solvent
Show Notes
18. 6. Metals are Usually Strong. They Have High Tensile Strength.
Show Notes
20. To Separate a Mixture of Alcohol and Water
Show Notes
21. 6. Non-Metals are Not Strong. They Have Low Tensile Strength.
Show Notes
22. To Study the Properties of a Compound of Iron and Sulphur
Show Notes
24. To Study the Properties of a Solution
Show Notes
27. Separation of Mixture Of Two Solids
Show Notes
28. 3. Metals are Good Conductors of Heat and Electricity.
Show Notes
30. 11. Non-Metals Have Many Different Colours.
Show Notes
32. Chemical Formula for daily use material
Show Notes
34. To Separate the Salt-Water Mixture (or Salt-Solution)
Show Notes
44. 7. Metals are Solids at the Room Temperature
Show Notes
46. 4. Metals are Lustrous (or Shiny), and can be Polished.
Show Notes
