2 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 the image. 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.
Answers: 2
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