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In this investigation, I intend to perform a fair and safe test into the water potential of potato cells.

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Introduction

An Investigation to find the Water Potential of Potato Cells. In this investigation, I intend to perform a fair and safe test into the water potential of potato cells. Osmosis 'Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water potential to a region of low water potential' Model: In this experiment I will fill 5 test tubes with a sugar solution, each will contain a different percentage of sucrose ranging between 0% and 20%. In each test tube there will also be 2 cylinders of potato. Over a period of time some potato pieces will gain mass and others will lose mass. My aim is to get as close to the concentration of sucrose in which no mass is gained or lost in the potato cylinder. This means that I am trying to get as close to the position where the water potential in the potato cylinder is equal to that of the surrounding sucrose solution. After the experiment the potato cylinders will be placed upon a balance separately and the results will tell me if I have succeeded in finding the solution in which no mass is gained or lost in the potato cells. ...read more.

Middle

a needle because it enables me to retrieve the potato cylinder from the inside of the cork borer without damaging it in any way Knife- I will use a knife because I will need to slice some potato from the bottom of it, to enable me to have a steady cutting platform Potato- I will use a potato for my experiment because potatoes are cheap and easy to use and their cells are pretty much identical to each other Sucrose Solution- I will use a sucrose solution because it is inert (not absorbed or used by the potato cells in any way). I will also use test tubes to keep the potato and solution inside and a test tube rack to keep them all in. Prediction My prediction is that the cylinders that are exposed to the least amount of sucrose are going to gain more mass and the cylinders that are exposed to the least amount of sucrose are going to lose mass. Also, somewhere within my sucrose solution percentage range, there will be a concentration in which no mass is gained or lost which is the aim of the experiment. Basically, my prediction is that the greater the concentration of the solution, the greater the loss of mass and the weaker the concentration of the solution, the greater the gain of mass. ...read more.

Conclusion

I can tell this because my line of best fit goes through the 0% mark, which tells me that at this point there has been no gain or loss in mass. Analysis I think that my experiment was quite successful although there probably were some faults made during it being carried out. This would have been due to human error. Small and seemingly insignificant things like not drying each potato cylinder and weighing them without due care and attention may have made a lot of difference in the outcome of the results. I also feel as if I could have done tasks more accurately- like in the weighing and cutting of the potato cylinder. Other than these things I was generally happy with the method of the experiment and how it was carried out. Evaluation I was very happy with my results, as they appeared to fit perfectly with my initial prediction. I predicted that as the concentration of the sucrose increased, the potato cylinder would lose mass and as the concentration decreased, the potato cylinder would gain mass. This was evident in my results as it clearly shows this pattern. I was also pleased because I attained no anomalous results that may have caused problems and may have brought my standard of performing the experiment into question. ...read more.

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