Investigating the Difference in Isotonic Point in Sweet and White Potato

3287 WordsMar 16, 201314 Pages
Investigating the Difference in Isotonic Point in Sweet and White Potato Research Aim: To observe whether equal sized white potato or sweet potato cores reached the isotonic point in the same concentration of sucrose solution. Introduction: Osmosis is diffusion of water from areas of high water potential to areas of low water potential. It does not require an input of energy. Plants use osmosis to transport minerals from their roots to their leaves, and to take in water in the soil. Because the plant cell is taking in water and minerals, its mass increases. The Maryland Department of Natural Resources states that “plants use water to carry moisture and nutrients from the roots to he leaves and food from the leaves back down to the…show more content…
The ruler is accurate to +/- 0.05cm. | Time the potato cores will be left in the solution for | Each solution will have a stop watch (+/- 0.05 seconds), ensuring that the cores will only be in the solution for 30 minutes. We also need to allow for human reaction time (215 milliseconds) and the time taken for us to start removing the potato cores from the sucrose solution (10 seconds). | Temperature of the solutions | The temperature of each solution will be taken at the start with a thermometer accurate to +/- 0.5°C, and they should all be the same temperature and will then be kept in the same room. Rather than actually controlling the temperature, the temperature was just monitored. | Volume of solutions | Using a 100ml measuring cylinder (+/- 0.5ml) and by getting down to eye level, the 50ml of solution for each beaker will be carefully poured out and put into the beaker. | Independent Variable | Concentration of sucrose solution | Different concentrations of sucrose solution (specifically, 0.25mol/dm³, 0.5mol/dm³, 0.75mol/dm³and 1.00ml/dm³) and distilled water (0.00mol/dm³) will be used. | Type of potato | Two types of potato (sweet potato and white potato). | Dependent Variable | The change in mass of the potato cores | The mass of the potato cores will be

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