ES

· Phase 1: Prediction & Strategy

1. My Prediction: Iodine and glucose will be able to diffuse across the dialysis tubing membrane, but not starch due to its molecular size.

2. My Strategy: I will place iodine on one side of the dialysis tubing and glucose and starch on the other. I will then test to determine if diffusion has occurred.

· Phase 2: Diffusion across a semipermeable membrane

1. Take piece of dialysis tubing from box and tie knot at bottom

2. Add glucose to dialysis tubing

3. Add starch to dialysis tubing

4. Add water to beaker

5. Add iodine to beaker

6. Select dialysis tubing to tie a knot. Put it in beaker

7. Insert glucose test strip into beaker to test for glucose. Compare results to chart. Dispose test strip into red autoclave bag. Record all observations in Lab Data before diffusion

8. Save image of dialysis tubing and beaker prior to diffusion

9. Let solution diffuse for 10 minutes; insert glucose test strip into beaker and dispose test strip

10. Take dialysis tubing out of beaker and place it into hand. Observe color inside dialysis tubing and beaker to indicate presence of starch and iodine. Record all observations in Lab Data

11. Save image of dialysis tubing and beaker after diffusion

· Phase 3: Conclusion

1. My Conclusion: Diffusion occurred based on molecular size. Iodine and glucose are much smaller molecules than starch; therefore, they were able to diffuse.

· Phase 4: Save Lab Data

1. Relevant Lab Data is available to be saved for personal reference. Data will be available if you return to this laboratory simulation