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Which of the following demonstrates imbibition?
Option: 1
A piece of rubber in kerosene oil
Option: 2
A piece of wood in kerosene oil
Option: 3
A piece of rubber in water
Option: 4
A grapefruit in saturated solution
Answers (1)
Imbibition
- It is a special type of diffusion through which water is absorbed by certain substances like colloids, making them increase in volume.
- The classical example of imbibition is absorption of water by seeds and dry woods.
- The water is actually adsorbed first on the surface of the substances.
- An adsorbent is necessary for the process of imbibition.
- For any substance to imbibe any liquid, the affinity between the adsorbent and the liquid is also a prerequisite.
- For example, the rubber will not show imbibition when placed in water but when the wood is placed in water, the imbibition will occur.
- The diffusion pressure of adsorbent/dry material is zero.
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Wood is extremely dry material that has zero diffusion pressure. When it is placed in oil, there is a steep diffusion pressure gradient and the imbibition will occur. Hence, the correct answer is option b.
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