Potato Osmosis Lab Report

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Osmosis in Potato Tubes


Osmosis is the movement of water molecules through a semi-permeable membrane from a high concentration to a low concentration.





To see the effects of different concentration of sugar solution on Osmosis in potato tubes.

Key factor:

In the investigation we change the sugar solution from: 0%-10%-20%-30%-40%-50% this is the independent variable; the dependant variable is the change in mass.


I predict that all the potato tubes in pure water or low concentration sugar solution will swell because water enters their cells by osmosis. The potato tubes in higher concentration sugar solution will shrink …show more content…

* Amount of sugar solution in each test tube.

* The potatoes have to have the same mass.

* Size of potatoes

* Diameter of each potato tube

* Time in sugar solution

We need to make sure in both experiments the fair test lists are used and the procedures are carried out. This needs to be done otherwise my results will not be accurate and will look odd.


Firstly we got out all our equipment. We then cut our potato tubes with the cork borer and cut them with the scalpel so they were the same length and weighed them. We then put one potato tube in each test tube and then added the same amount sugar solution in to each tube. The concentration of sugar solutions varied in each test tube.

We then put the stopwatch on and left them for half an hour. After we weighed each potato tube and recorded our results. We did the experiment twice. We did this to make sure our results were correct.

Preliminary method:

We did everything the same as in our other experiment except we

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