Osmosis practical-investigation in water potential of potato

• Step 1

  Prepare the 1 mol dm, 0.8 mol dm, 0.4 mol dm, 0.2 mol dm and 0 mol dm solutions
• step 2

  label 5 boiling tubes with their strength and place 20cm^3 of water/sucrose solution into the corresponding tube using a syringe
• step 3

  create a results table
• step 4

  use the cork borer, knife and ruler to cut 5 potato chips that are 30mm long and remove the skin
• step 5

  carefully dry the potato chips using a paper towel by rolling them
• step 6

  • use the balance to weigh the chips
  • Record its mass in the results table
• step 7


  repeat for all 5 solutions and place bungs in tubes
• step 8


  leave in tubes for at least an hour
• step 9


  remove the chips one at a time, roll in the paper towel and reweigh recording the mass in the table
• step 10

  use the start and end mass to calculate the percentage change in mass of each chip and record on the table
• step 11

  plot a graph of percentage change in mass against the concentration of sucrose solution