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Osmosis Lab Report

746 words - 3 pages

Introduction
Water can diffuse across the partially permeable membrane of cells depending on the concentration difference between the inside and the outside of the cells. You are going to look at the effect of different concentrations of sugar solutions on potato cells. By measuring the mass of the potato cylinders, you will be able to find out if water has entered or left the potato cells.

Aim
To find out what happens to the mass of potato cells when they are left in increasingly concentrated solutions.

Hypothesis
My hypothesis was that if the concentration of sugar where the water potential is higher than the water potential of the potato, the mass of the potato will increase. On ...view middle of the document...

It is also a good idea to label the boiling tube “1”, “2” and “3”.
6. Repeat step 5 and 6 for all of the solutions but label the boiling tubes appropriately.
7. Using a 6mm cork borer and a ruler, cut three potato cylinders that are each 4cm long.
8. Dry the potato cylinders with the paper towel and measure their masses.
9. Put one potato cylinder into each boiling tube for 30 minutes.
10. Take the potato cylinders out of the boiling tubes. Dry the potato cylinders with paper towel.
11. Record down their new masses.
12. Calculate the percentage change in mass in different sugar solutions.
13. Calculate the average values for the percentage change in mass in different sugar solutions.
14. Note down your results in a table.

Diagram

Results
Concentration of sugar solution (%)
B2oiling tube
Mass before (g)
Mass after (g)
Change in mass (%)
0
1
0.5g
0.52g
+0.02g
0
2
0.51g
0.51g
same
20
1
0.52g
0.473g
-0.047g
20
2
0.42g
0.411g
-0.009g
40
1
0.50g
0.323g
-0.177g
40
2
0.51g
0.313g
-0.197g

Conclusion
To conclude, I am able to see the effect of different concentration on the rate of osmosis through this experiment. The experiment...

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