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# To Demonstrate Osmosis ## Experimental Procedure: - Soak 2 strips of Visking tubing in water. - Tie knots in the ends of each and fill with solutions as shown in the diagram. - Seal both tubes, dry the outsides and record the mass of both using an electronic balance. - Note the fullness/turgidi...

# To Demonstrate Osmosis ## Experimental Procedure: - Soak 2 strips of Visking tubing in water. - Tie knots in the ends of each and fill with solutions as shown in the diagram. - Seal both tubes, dry the outsides and record the mass of both using an electronic balance. - Note the fullness/turgidity of both. - Set up as shown for 30 mins. - Remove the tubes, dry them and reweigh both. - Note any change to fullness/turgidity. ## Results: - The visking tubing with the sucrose solution increased in mass and fullness. This is due to water entering the tube by osmosis. This occurred due to the less concentrated solution external to the tubing. - The tubing with water showed no change in mass. Osmosis was not seen to occur. - This is because there was no difference in concentration between the bag contents and the beaker contents. ## Notes: - Visking tubing is used because it is similar to a cell membrane - it is semi-permeable. - It will only allow molecules that are small enough to pass through. ## Other examples of semi-permeable materials are: 1) Cellophane 2) Dialysis Tubing