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