their differences. Give your students potato "cylinders" that are uniform in length and size: for instance, you could cut them to be 70 mm in length and 7 mm in diameter. Salt, Sugar and Pure Water, this experiment helps students to differentiate between different degrees of concentration gradients. Weigh each group, on a mass balance, before immersing it in the appropriate sucrose solution for half an hour. There were varying concentrations of sugar in the potato chips themselves. If there is a barrier that is a selectively permeable membrane which only allows water molecules pass through it, the result is that only water moves - from the weaker solution to the stronger solution.
BBC Bitesize - gcse Biology (Single Science) - Movement across Investigate the Rate of Osmosis in Different Vegetables
White tile, scalpel, ruler, cork borers to cut potatoes, or potato chipper (. Keep in mind the fact that the potato chips juice will make the surfaces slippery. Final volume of solution made (cm3) Preparation a Label beakers/ boiling tubes with the concentrations of blackcurrant squash. Volume of blackcurrant squash needed to make 30 cm3 of solution ( A x 3). It is a solution because the sugar, which is a solute, is dissolved in water, which is a solvent. Controlled: Size of potato chips and amount of solution used. Apparatus and Chemicals, for each group of students. Leave them for osmosis to occur. I shall use varied amounts of sucrose solution for each test in order to adjust the concentration - a solution containing more sucrose has a greater concentration than a solution containing less sucrose solution. Investigation d Dry the chips on a paper towel. Observe that the slice placed in salt is very flexible, while the slice placed in sugar is flexible, but less. Dependant: Difference in mass.