A group of students from Awasi Boys High School set up an experiment to demonstrate a certain process. The experimental set up were as shown in the diagrams below.

A group of students from Awasi Boys High School set up an experiment to demonstrate a certain process. The experimental set up were as shown in the diagrams below.

After 10 minutes the students recorded their observation in a table as shown below.

a) Name the process being demonstrated by this experiment. (1mk)

Diffusion
b) Explain the result in the experiment set up I. (3mks)

  • Visking tubing is semi-permeable
  • Iodine molecules Move from beaker into the visking tubing
  • Thus producing the blue-black colour with starch solution
  • Starch molecules are too large to pass through the walls of the visking tubing into solution in the beaker
  • therefore Iodine solution doesn’t change colour

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