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Aim: Determine the sugar concentration in potato cells

IV ~ Concentration of sugar solution DV~ Percentage change in mass

1. Cut up an innocent potato into equal sized cylinders and record mass using a top pan balance (ensure no skin is on the potato)
2. Place each into a test tube with at least 3 different concentrations of solution (at regular intervals eg. 0.2, 0.4) and leave for 24 hours
3. Remove cylinders, blot off excess water with a paper towel
4. Reweigh with the balance and calculate the percentage change in mass
5. Repeat 2 more times for each conc. and calculate mean, excluding anomalies
6. Plot the percentage change in mass against the concentration in a graph

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Control variables

• Time each potato is in solution
• Type of potato
• Same size / mass potato pieces </aside>

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RISKS

• Sharp knife can cut your skin —> cut away from your body </aside>

The further the concentration of the sugar solution is from the potato, the higher the concentration gradient is → more osmosis occurs + more water leaves/enters the potato → the mass of the potato changes.

Therefore, the point at which the line crosses the x axis is the concentration of the potato (no osmosis → 0% change in mass)

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