Description
Osmosis is defined as the movement of water across a selectively permeable membrane from an area of high concentration to an area of lowconcentration. In order to demonstrate this process, students used dialysis tubing and solutions with varying concentrations. Six student groupsmade three separate dialysis sacs containing a 15% glucose solution. Each bag’s initial volume was recorded (Table 1). Afterwards, each dialysis sac was placed in one of three separate beakers containing a different solution.Beaker A contained distilled water. Beaker B contained a 15% glucose solution. Beaker C contained a 30% glucose solution. After 45 minutes, the bags were removed from the solution, dried off and the final volume was measured. The final volume was recorded in Table 1.
|
Condition 1 |
Condition 2 |
Condition 3 |
|||||||||
|
Beaker A |
Beaker B |
Beaker C |
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|
Group |
Initial Volume (mL) |
Final Volume (mL) |
Volume Change (mL) |
Group |
Initial Volume (mL) |
Final Volume (mL) |
Volume Change (mL) |
Group |
Initial Volume (mL) |
Final Volume (mL) |
Volume Change (mL) |
|
1 |
8.1 |
10.6 |
|
1 |
7.5 |
7.5 |
|
1 |
7.2 |
6.1 |
|
|
2 |
6.4 |
8.2 |
|
2 |
7.7 |
7.7 |
|
2 |
7.5 |
6.4 |
|
|
3 |
7.2 |
9.4 |
|
3 |
6.5 |
6.5 |
|
3 |
8.1 |
6.2 |
|
|
4 |
7.5 |
9.9 |
|
4 |
8.8 |
8.8 |
|
4 |
6.2 |
4.5 |
|
|
5 |
6.9 |
8.8 |
|
5 |
7.1 |
7.1 |
|
5 |
7.6 |
5.2 |
|
|
6 |
6.4 |
8.4 |
|
6 |
6.4 |
6.4 |
|
6 |
6.4 |
4.5 |
|
|
|
|
TOTAL: |
|
|
|
TOTAL: |
|
|
|
TOTAL: |
|
|
|
|
MEAN: |
|
|
|
MEAN: |
|
|
|
MEAN: |
|
Table 1
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