From this information, I think that the lower the concentration of sugar in the solution, the lower the mass of the potato would be. This is because the water molecules in the solution would be able to diffuse into the potato chips, however the sugar molecules are too large to pass through the partially permeable membrane of the potato chips.
In order to maintain an accurate investigation, I must maintain the same variables for all investigations. They are:
∙ The size and weight of the potato chips.
∙ The same temperature
∙ Duration of experiment
∙Solution volume
However, the only variable I would change in order to obtain results, is the concentration of sugar solution
Equipment List:
- 1 Racks
- 6 Test tubes
- Molar Sucrose and distilled water
- Potato
- Cutting Tile
- Knife
- Cork Borer
- Plunger
- Measuring cylinder
From my preliminary investigation I have set out a method for this investigation.
Method:
1. Collect three average sized ground potatoes of same variety.
2. Cut out 6 pieces of potato. In order for my investigation to be accurate I will be checking the results with three other sets of data..
3. Take a test tube rack, and then place 5 test tube then label them (0 molar, 0.2 molar, 0.4 molar, 0.6 molar, 0.8 molar 1 molar).
4. Weigh the chips ensuring all same weight (variable of maximum 10mg), record the results.
5. Using a measuring cylinder measure out different amounts of sucrose solution and distilled water (35ml). Prepare the solutions of concentrations 0 molar, 0.2 molar, 0.4 molar, 0.6 molar and 0.8 and 1 molar. Pour into the test tubes in percentage ratio giving the various molar concentrations.
6. Then put the chips into the tubes, and record the time, which might be needed for future purposes.
7. Allow the chips to stay in the test tube racks for approximately 24 hours.
8. When bringing out the potato chips, record the time. Then dry all potato chips then weigh them. Dryness is needed so that the weight of the potato chips is accurate.
9. Repeat the experiment for accuracy.
Prediction: I predict that the lower the concentration of sucrose the higher the growth rate.