Modelling diffusion

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How to model diffusion?

  • Visking tubing  is a non-living partially permeable material made from cellulose

  • It can be used to model the process of diffusion

  • Pores in the membrane are small enough to prevent the passage of large molecules (such as starch) but allow smaller molecules (such as glucose) to pass through by diffusion

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<p>Investigating diffusion with Visking tubing</p>

Investigating diffusion with Visking tubing

  1. Tie off the Visking tubing at one end and fill with a solution of starch and glucose

  2. Tie off the other end of the tubing

  3. Place in a beaker of distilled water and leave overnight

  4. Test the contents of both the Visking tubing and the beaker for: Glucose and Starch

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What is the tests used for starch and glucose?

  • Glucose = Using Benedict's solution

  • Starch = Using iodine solution

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What do the results look like?

  • Glucose is present in the beaker and in the Visking tubing = It has diffused through the pores of the Visking tubing

  • Starch is only present in the Visking tubing = Starch molecules are too large to diffuse through the Visking tubing pores