If you have placed starch and water in the beaker and placed glucose and iodine inside the dialysis bag, what results would you have observed?

There would be no movement of starch through the membrane of the dialyzing tube.

Explanation:

In order to check the permeability of dialyzing tube to glucose, starch and iodine an experiment can be done. In the experiment starch and glucose are added inside a dialyzing tube and placed it inside  a beaker containing water and iodine mixed together. The color of the solution in the beaker in the beginning was yellow amber.

After placing the tube inside the beaker for 30 minutes, observations are recorded.  The contents of the tube turned blue black due to the reaction between starch and iodine. This implies that iodine has moved into the tube through the semi permeable membrane.

Adding Benedictine reagent to the contents of the beaker turned it yellow indicating the presence of glucose in the beaker. This implies that glucose has passes through the membrane into the beaker. But no color change is observed in the beaker after the experiment.  

If starch had moved into the beaker, the color would have been blue black due to starch reacting with iodine. But this doesn’t happen indicating that the membrane is impermeable to starch and starch shows no movement in this experiment.

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