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Osmosis Exper

Osmosis Experiment - Leaving Cert Biology

QuestionAnswer
What is the first step in the Osmosis experiment? Soak two strips of Visking Tubing in water.
What is Visking Tubing? A form of Semi-permeable Membrane.
Why does the Visking Tubing need to be soaked in water before the experiment takes place? It needs to be soaked in water so that it is easier to work with as it softens them.
The second step in the Osmosis Experiment? Tie one knot in one end of each strip.
Third step of the Osmosis experiment? Dissolve a large amount of sucrose (sugar) in a beaker of warm water, forming a concentrated sucrose solution.
Why is warm water used to dissolve the sucrose ? It is a better Solvent than cold water.
What is the 4th step of the Osmosis Experiment? Fill the first Visking Tubing 2/3s full with sucrose solution then tie the other end.
5th step of the Osmosis experiment? Fill the second Visking Tubing with distilled/deionised water and tie a knot in the other end.
The Sixth step of the Osmosis Experiment? Dry each tube, note turgidity of each tube and record the mass.
The 7th step of the Osmosis Experiment? Place each tube of the Visking Tubing in a beaker of distilled/deionised water.
How long should you leave the Visking Tubing in the beaker of deionised water for? 30 Minutes.
8th step of the Osmosis experiment? Remove the Tubing from the beakers, dry them, record 'fullness' and record the mass of each bag.
What results should you expect? - The Visking Tubing that contains the sucrose solution will have filled with water and gained mass due to Osmosis. - Th Visking Tubing containing distilled/deionised water should show no change in mass as it has not lost or gained any water.
Created by: AW117
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