Requirements
5OOcm3 beaker, visking tubing, a piece of thread, glass rod, concentrated sugar solution, 500 cm3 distilled Water.
Procedure
1. Into the beaker, put 350 cm3 of the distilled water.
2. Dip the visking tubing in water to moisten it. Open the visking tubing and tie one end with the thread provided.
3. Half fill the visking tubing with the sugar solution provided and then tie the open end of the tubing. Ensure no sugar solution spills out of the tubing.
4. Immerse the visking tubing into the distilled water in the beaker and suspend it using the glass rod provided.
5. Leave the set up for about 30 minutes.
6. Record your observations.
7.Explain the observations made.
Observations
The visking tubing became swollen indicating that its cell contents increased. The amount of water in the beaker decreased. This implies that water moved from the beaker into the visking tubing.
Explanation
The visking tubing contains both sugar and water molecules. The beaker contains a higher concentration of water molecules than the visking tubing. The water molecules diffused from the beaker (where they are highly concentrated) into the visking tubing (where they are lowly concentrated).
Even though there is a higher concentration of sugar molecules in the visking tubing, they were not able to diffuse out of the visking tubing due to their large molecular sizes. The visking tubing is semi permeable.
Other than visking tubing, dialysis tubing or cellophane are also other semi permeable membranes that can be used in this experiment.
Anganifelix answered the question on May 8, 2018 at 12:26
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