Edexcel IGCSE Biology · Spec 2.17
Osmosis Practical
Required practical: investigating osmosis in potato tissue and calculating the percentage change in mass.
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Osmosis Practical
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Spec 2.17
What you need to know
- Investigate osmosis using potato tissue
- Describe the method and the measurements
- Explain the results
Active recall
Quick check
Answer each question before opening the answer.
What happens to potato mass in a dilute solution and in a concentrated solution?
In dilute solution water moves in, so mass increases. In concentrated solution water moves out, so mass decreases.
What does the point of zero mass change tell you?
The external solution concentration equals the concentration inside the potato cells (isotonic).
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