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Paper 6Alternative to PracticalPractical1 marks
Investigating the effect of surface area on diffusion rates.
Method
Diffusion Experiment Method
In this experiment, cubes of agar gel containing phenolphthalein are placed in a dilute acid solution. The time taken for the color to change is measured.
| Cube Size (cm³) | Time for Color Change (s) |
|---|---|
| 1 | 30 |
| 2 | 15 |
| 3 | 5 |
- a[1]
State the independent variable in this experiment.
Aim for approximately 1 distinct marking point.
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