Determining water potential by measuring changes in mass - osmosis

Question 1

What happens when 2 solutions of diff water potential are separated by a selectively permeable membrane?

Answer 1

Water will move into the solution with the lowest water potential

Question 2

What are examples of solutions in cells?

Answer 2

Cytoplasm + cell sap

Question 3

Explain 1st half of the method (prepping potato):

Answer 3

1. Label six boiling tubes with 0, 0.2, 0.4, 0.6, 0.8, 1 M
2. Put 30cm3 distilled water in first tube + same amount of salt solution in rest of tubes. Put a stopper on tube
3. Use cork borer + scalpel to prep 6 potato cylinders of 50mm long
4. Blot each cylinder dry

Question 4

Explain 2nd half of method: (experimenting)

Answer 4

5. Record mass of each cylinder then put 1 in each tube
6. Wait 45 mins then remove cylinders from their tubes, blotting them with filter paper
7. Reweigh each cylinder + work out mass change