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Semi permeable membrane?
Visking tubing
Procedure
Cut equal lengths of visking tubing. Tie a knot at one end. Sucrose solution goes in one, distilled water goes in other. Make sure they are the same mass.
Beaker
Place both and into a beaker of distilled water. After a while, remove and find new mass.
Results
The concentration of the sucrose solution tube will have decreased. This demonstrates osmosis.