in the potato osmoscope experiment why the potato is peeled
Answers
Answer:
Osmosis is a special type of diffusion of liquids. When two solutions of different concentrations are separated by a selectively permeable membrane, diffusion of water or solvent molecules takes place from the solution of lower concentration to the solution of higher concentration. This process is called Osmosis. In other words Osmosis is the diffusion of water or solvent from a region of its higher concentration to a region of its lower concentration through a selectively permeable membrane. This can also be expressed as the movement of water from a region of higher free energy of water or water potential to a region of lower free energy of water potential through a selectively permeable membrane.
Hypertonic, Hypotonic and Isotonic solutions
Imagine a system in which an aqueous solution A with high concentration of solute is separated by a selectively permeable membrane from an aqueous solution B with a low concentration of solute. Solution A is said to be hypertonic to solution B, and solution B hypotonic to solution A. In this situation, there will be a net movement of water or solvent molecules through the membrane from the hypotonic solution to the hypertonic solution by osmosis. This will continue until equilibrium is reached, at which point there is no further movement of water and the two solutions are described as isotonic.
Demonstration of Osmosis
The process of osmosis may be demonstrated by the simple osmometer which is the thistle funnel experiment.
Potato Osmoscope
Demonstration of osmosis in a living system can be one using the potato osmoscope.
A potato is peeled and one side is flattened which serves as the base. A cavity is made in the potato and is filled with concentrated sugar solution and a pin mark is made to indicate the initial level. This potato is then placed in a beaker containing coloured water for some time.
Observation
It is observed that the sugar solution in the cavity of the potato becomes coloured and level rises
Inference
This proves the entry of water into the sugar solution through the potato tissues which serve as the selective permeable membrane.
Explanation:
The process of osmosis may be demonstrated by the simple osmometer which is the thistle funnel experiment.
Potato Osmoscope
Demonstration of osmosis in a living system can be one using the potato osmoscope.
A potato is peeled and one side is flattened which serves as the base. A cavity is made in the potato and is filled with concentrated sugar solution and a pin mark is made to indicate the initial level. This potato is then placed in a beaker containing coloured water for some time.
Observation
It is observed that the sugar solution in the cavity of the potato becomes coloured and level rises
Inference
This proves the entry of water into the sugar solution through the potato tissues which serve as the selective permeable membrane.
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