First of all this week we started to learn about diffusion and osmosis and how important they are to living organisms. They are the process of water and certain solutes moving in and out. Diffusion and osmosis do not require any added energy.
What we had to do!
In this lab my group and I had to get one cup that was eight ounces, then fill it two thirds full of water. Then we added about 10 drops to the water and mixed it together. We used glucose test strip to test the iodine water solution. Then we used dialysis tubing to hold a solution of glucose and starch and tied up bother sides, so the water is trapped in the bag. Afterwards we tested the solution in the bag then we set the bag in the beaker of water and waited about 24 hours to see the reaction. In the end we noticed that the iodine went into the bag and some of the glucose starch solution leaked a little into the water. Also, the bag had expanded from its original size.
Results
Iodine was absorbed in the bag and glucose was released out of the bag into the water solution. The starch would stay the same, it only reacted with the iodine in the bag. The water was no longer a rusty color in the beaker, instead it was a purplish color in the dialysis bag. There was also more water in the dialysis bag afterwards and the bag had low concentration of iodine.
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