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Purpose: The purpose of this lab was to study the diffusion of molecules
Through starch, iodine, sugar, and benedicts.
Hypothesis: I think the starch will seep through the bag and when we pour
the iodine in, it will become lucid in some areas and less in others.
1. dialysis tubing with string
2. pour starch solution into a 50 ml beaker
3. pour in and seal (starch)
4. rinse with water
5.set in water for 10 minutes
7.add iodine for testing
8.throw away bag and wash beaker well
Data and observation: After adding iodine solution to the water the bag
turned a dark black and the water kept it yellow-brown.
Calculations: The similarities and differences in the set up of an actual cell
and the anylize tube is…….
Similar and different
If I added a digestive enzyme to the starch solution inside the dialysis, the
starch would be able to pass through the membrane because the starch would
break down when the enzyme was added.
Conclusion: What I learned from this experiment was to see how a cell
membrane let some molecules pass through and some didn’t, the sugar and
starch. What happened was that when I added the iodine to the water and
the starch solution was inside of the tube. It showed that the water kept a
yellow brown color while the tube had a dark almost black color. Which
means that the starch couldn’t get through and the water could. With the
sugar, when adding the Benedict’s solution it changed colors because the
sugar and water was able to pass freely throughout the membrane. For our
lab the sugar benedict solution did not turn out the way planed. I think
because we did not wait long enough for results.
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Chemistry, Carbohydrates, Excipients, Membrane technology, Starch, Nutrition, Iodine, Dialysis, Sugar, Lugols iodine, Dextrin
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