Cell Transportation Lab

By: Apoorva Mutyala

Introduction

In this lab the process of osmosis was explained visually. The lab was incubated overnight for the most efficient results. The evidence of osmosis was shown by the change of weight

-in grams- of our tested item. This experiment was used to show the process of osmosis in a visual format.

Osmosis is the movement of water in a semi-permeable environment. The purpose if this was to prove the theory of osmosis. The dependent variable is the mass of the tubes. The independent are the solutions. The controls and constants are, the amount of water in the tubes, the size of the cups, the amount of solution, and the types of tubes. The results are as reported below.

Hypothesis

  • If the soda has more sweetener, then more water molecules will exit the tube.
  • If the distilled water has fewer solutes, then more water molecules will enter the tube.

Materials

  • 3 dialysis tubes
  • 3 cups
  • A funnel
  • A graduated cylinder
  • 200 mL of 3 different solutions
  • A balance
  • String
  • 20 mL of drinking water
Big image

Procedure

  1. Gather your materials
  2. Tie one end of the dialysis tube tightly with the string
  3. Place funnel at the opposite end of the tied section
  4. Pour 20 mL of drinking water into the tube.
  5. Repeat step 2 on the other end of the tube
  6. Repeat steps 2-5 on the other 2 dialysis tubes
  7. Measure and record the mass of each dialysis tube
  8. Pour 200 mL of each solution into different cups
  9. Place a dialysis tube into each cup
  10. Wait 24 hours
  11. Remove dialysis tubes from cups and record mass
  12. Record data and create conclusion

Results

Distilled Water Tube - (before) 14.9 g; (after) 14.1 g

Regular Soda Tube - (before) 18.8 g; (after) 13.8 g

Diet Soda Tube - (before) 17.4 g; (after) 15.4 g

Conclusion

In this lab the results above show that the tube in the regular soda had the most change. This was a change of 5 grams. This shows that the drinking water molecules were mostly attracted to the regular soda's molecules. This basically means that the solution was hypertonic. This can be inferred due to the fact that the drinking water molecules were attracted to this solution the most and in result, shrank. All of these solutions can be classified as hypertonic because all of the dialysis tubes "shrank" in size. This means that the solutes outside the tube were greater than inside. In conclusion, it can be shown that drinking water is most attracted to regular soda.