Experiment on Osmosis
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1. Experiment to demonstrate the osmosis by using sheet of cellophane or goat bladder:
Requirements:
Beaker, thistle funnel, goat bladder or sheet of cellophane, thread, water and sugar solution.
ADVERTISEMENTS:
Method:
1. Cover the lower opening of the glass tube with the goat bladder or sheet of cellophane and tie it with the thread.
2. Fill in the interior of the tube with molasses, a concentrated sugar solution in water.
3. Place the whole apparatus in a beaker containing water, preferably distilled water.
ADVERTISEMENTS:
4. Note the level of the water in the thistle funnel and keep the apparatus to note the results.
Observations:
Level of the water in the thistle funnel increases (Fig.2).

Results:
1. Movement of water through the goat bladder or cellophane sheet into the thistle funnel takes place.
2. Water concentration in beaker is 100% while in the sugar solution it is less than this, and, therefore, the water from the region of higher concentration moves towards the region of lower concentration. The movement is through a semipermeable membrane and so the experiment shows the phenomenon of osmosis.
3. The force, with which the solution level in the tube increases, arises from the pressure exerted by the diffusion of water molecules into the tube. This pressure is called osmotic pressure.
4. Stability of the water level in the funnel indicates that water concentration in both the beakers as well as funnel is same and thus osmosis stops.
Requirements:
Beaker, thistle funnel, goat bladder or sheet of cellophane, thread, water and sugar solution.
ADVERTISEMENTS:
Method:
1. Cover the lower opening of the glass tube with the goat bladder or sheet of cellophane and tie it with the thread.
2. Fill in the interior of the tube with molasses, a concentrated sugar solution in water.
3. Place the whole apparatus in a beaker containing water, preferably distilled water.
ADVERTISEMENTS:
4. Note the level of the water in the thistle funnel and keep the apparatus to note the results.
Observations:
Level of the water in the thistle funnel increases (Fig.2).

Results:
1. Movement of water through the goat bladder or cellophane sheet into the thistle funnel takes place.
2. Water concentration in beaker is 100% while in the sugar solution it is less than this, and, therefore, the water from the region of higher concentration moves towards the region of lower concentration. The movement is through a semipermeable membrane and so the experiment shows the phenomenon of osmosis.
3. The force, with which the solution level in the tube increases, arises from the pressure exerted by the diffusion of water molecules into the tube. This pressure is called osmotic pressure.
4. Stability of the water level in the funnel indicates that water concentration in both the beakers as well as funnel is same and thus osmosis stops.
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