8.1 Water potential of potato cells

Question 1

What is the method for investigating what a potential of potatoes

Answer 1

1. Perform a serial dilution to produce concs:0.4, 0.2, 0.1, from 0.8mol/dm3
2. Label these 4 & an additional 1 wt water
3. Cut 5 potato chips that are 40mm no skin, Dry Them all equally and weigh them
4. Place them in the sol and place a bung
5. Leave them for at least one hour then take them out in the same order they were put in and dry them equally
6. Reweigh them and record the results
7. use start and end mass to calculate percentage change and plot a graph

Question 2

Why is it important to dry the chips in the same way

Answer 2

So the weight of the liquid is not included in the results
To improve accuracy of results

Question 3

What was the purpose of the bungs

Answer 3

To ensure water doesn’t evaporate

Question 4

What are the two steps in this procedure Of investigating what potential of potatoes that must be followed to obtain the valid results

Answer 4

Dry them all equally
use a bung on top of the boiling tube