osmosis

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  • exchange of materials- osmosis
    • 1. tie wire around one end of visking tubing. put glass tube in other end+ fix with wire
      • 2. pour sugar solution down glass tube into visking tubing
        • 3. put visking tubing into beaker of pure water + measure where sugar solution comes up to on glass tube
          • 4.leave overnight, measure where liquid is on glass tube. Water should be drawn into visking tubing by osmosis- will force liquid up glass tube.
      • visking tubing- partially permeable membrane
    • partially permeable membrane- has small holes- only tiny molecules get through
    • only movment of water
    • in and out of cells- through cell membrane
    • high water concentration- dilute solution
    • low water concentration- more concentrated solution
    • steady net flow to area of lower concentration

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