Plan

My experiment is to investigate the effect of osmosis on potato tissue. In this experiment there are two variables (things that change to effect the results), which are; the mass change and the length change of the potato chip. From a preliminary experiment that I did, the results showed me that there was a large mass change in the chips and the length hardly changed at all. This shows that to be able to obtain some good results I will need to measure the change in mass.

Using the results from the preliminary experiment I have decided to use 5 different concentrations of Sucrose Solution to water because I will then be able to obtain a variety of results, which will give me a good overall percentage change for each of the solutions.

Sucrose Concentration (%)

Volume of 25% Sucrose Solution (cm)

Volume of Water (cm)

25

20

0

18.75

15

5

12.5

10

10

6.25

5

15

0

0

20

This is how I will do the experiment:

· Collect all the equipment which will include;

15 Petri Dishes

1 potato

1 knife

Parapets

Measuring Cylinder

Filter paper

Sucrose Solution and Distilled Water

· Cut the potato up into even sized small and thin slices

· Weigh each potato chip and record

· Measure out the concentration of the sucrose solution and the water using the measuring cylinder, and then place into the Petri dish

· Place 3 potatoes in the Petri dish and close the lid, label and then leave to let osmosis take place

· Repeat for the other 4 concentrations

· After leaving for a certain time come back to the dishes and take the potato chips out

· Blot each of the chips dry using the filter paper and then re-weigh each chip and record

· Calculate the mass change and the percentage mass change

· The equipment that will be in use in this experiment is Petri Dishes, a knife, and