It is known that liquids move from a low concentrated area to a higher concentration. This is more commonly known as osmosis. The liquids try to balance out the concentration. Osmosis occurs commonly in cells.

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OSMOSIS EXPERIMENT

Planning Experimental Procedures

It is known that liquids move from a low concentrated area to a higher concentration. This is more commonly known as osmosis. The liquids try to balance out the concentration. Osmosis occurs commonly in cells. Substances such as water are diffused into the cell until the concentration from the outside and inside of the cell are as equal as possible.

The aim of the investigation is to see if increasing the surface of a potato tube will affect how fast the process of osmosis takes place for the movement of water in or out of the potato.

The apparatus and resources that are going to be needed to go through with this experiment is: distilled water, Electric scales, Potato, cork borer, knife, Measuring cylinder, test tubes,

i first had to get a potato. i than used a cork borer to cut out about six potato cylinders. For safety, i did not hold the potato in my hand while cutting out the cylinder but left it on the desk. Each cylinder had to be the same size and because we got a small potato i cut out six cylinders at the length of 3cm long, they all had to be 3cm long otherwise it would not have been a fair test. Not every cylinder came out 3cm long and so we had to use a knife to cut it down to size, care was taken whilst using the knives. i than weighed each potato cylinder and recorded the results that we got. Next, i took six test tubes filled with 25ml of distilled water. In the first one i put a whole potato cylinder in the test-tube, in the second i cut the potato cylinder into two, and for the next i cut it into four, six, eight and the last we cut into ten, we than left it in their for a long period of time. When I return to them I will dry of the potato samples making sure they stay in order. I will then re-weigh the potato samples and record these results. After doing this I will find out how much the weight has changed and by what percentage, by using the following method:
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% Increase in mass = increase in mass ´ 100.

I will then try to link this with the explanation of osmosis to see if there is a link between more surface area and increase in overall weight after a day.

This experiment was repeated another two times, to make the experiment a fairer test.

To make the experiment safe, all I can do is carrying out the obvious. This includes tucking in stools and placing bags under desks. I must stand when doing the experiment and never run for any reason, laying paper towels, ...

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