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)
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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