A student investigated the diffusion of substances through Visking tubing, an artificial membrane which has some of the properties of cell membranes. The student made a bag of Visking tubing as shown in Fig. 4.1. top of syringe test-tube elastic band Visking bag starch solution bag filled with starch solution and placed into a test-tube of water water knot Fig. 4.1 The student added some iodine solution to the water in the test-tube. After 30 minutes at room temperature, the contents of the Visking bag were stained blue-black, but the water outside remained a yellow colour. (a) (i) Explain these results.
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A student investigated the diffusion of substances through Visking tubing, an artificial membrane which has some of the properties of cell membranes
The student made a bag of Visking tubing as shown in Fig. 4.1.
The student added some iodine solution to the water in the test-tube.
After 30 minutes at room temperature, the contents of the Visking bag were stained blue-black, but
the water outside remained a yellow colour.
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Visking tubing is a selectively permeable membrane, this means it has pores in it which allow small molecules through but not larger molecules.
hope this helps!
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