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An investigation is carried out to study osmosis using dialysis tubing. Bags made from dialysis tubing are filled with sugar solutions of different concentrations and placed in distilled water. The change in mass of each bag is measured after 30 minutes.
Method
Method for Osmosis Investigation
1. Cut equal lengths of dialysis tubing and soak in water to soften. 2. Tie one end of each tubing to form a bag. 3. Fill each bag with 10 cm³ of sugar solution at different concentrations (0%, 10%, 20%, 30%). 4. Tie the open end securely. 5. Blot dry and weigh each bag. 6. Place each bag in separate beakers containing 100 cm³ distilled water. 7. Leave for 30 minutes at room temperature. 8. Remove bags, blot dry, and weigh again. 9. Record the change in mass for each bag.
| Sugar concentration (%) | Initial mass (g) | Final mass (g) | Change in mass (g) |
|---|---|---|---|
| 0 | 5.0 | 5.5 | +0.5 |
| 10 | 5.1 | 5.4 | +0.3 |
| 20 | 5.0 | 5.0 | 0 |
| 30 | 5.2 | 5.0 | -0.2 |
- a[1]
Identify the independent variable in this investigation.
Aim for approximately 1 distinct marking point.
- b[2]
Describe how you would measure the dependent variable in this investigation.
Aim for approximately 2 distinct marking points.
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Answer every part before opening the mark scheme.
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