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Osmosis in potatoes and how various concentrations of salt solution in which potato chips are placed, affect osmosis in the cells.

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Introduction

Biology Coursework: osmosis in potatoes and how various concentrations of salt solution in which potato chips are placed, affect osmosis in the cells. Aim: The aim of this investigation is to see how changing the concentration of salt in a solution will affect osmosis in potatoes. Variables: * The temperature will affect osmosis in cells because the potatoes might cook only a bit and this should cause the tiny paws in the potato to close. * The amount of salt in the concentration will affect the experiment because the greater the amount on the other side, the faster the water moves from ones side to the other. * The surface area of the potato chips is another variable. A larger surface area will be able to absorb more water and there will be more of a permeable surface for the water to move through. * The volume of water is also important. A weaker concentration of salt will affect the rate of reaction because osmosis is the passage of water from a region of high water concentration through a semi permeable membrane to a region of low water concentration.

Middle

When I have left it for a while, I will take out the potatoes and weigh them all again and find out the different from the before and after weight. I will then take the average of the potatoes from each of the different concentrations. Diagram: Safety: I will need to make sure that I carry out the experiment safely and efficiently. To do this I will make sure I: * Will wear goggles to prevent anything from going in my eyes. * Will use the knife with precaution and make sure that none is around me when I am using it. * Keep the water off the surface and floor to prevent people from slipping. * Will work in an area with space so that I don't get in anyone's way. Results: Concentration: 0 Mass before Mass after Average mass before Average mass after Average change in mass % (Average in mass) 1.97 2.5 2.2 2.74 1.98 2.49 0.51 1.78 2.25 Concentration :0.

Conclusion

You can also see that the masses of the potato chips before the experiment are all quite close together and this is good because it made the experiment much more fairer and enabled me to get more accurate results. The graphs and the results show that: * Osmosis actually took place in the experiment. * As the concentration increased, the percentage of the weight difference decreased with it. Evaluation: I think that the investigation was good because I got good accurate results and I think that this is due to the fact that I did actually make the experiment a fair test. To make this experiment better, I believe that I could have done one test at a time so that I could have concentrated on one at a time to make it fairer and even more accurate. I could have also been more organised in my group so that I would have concentrated more, therefore have gotten better and fairer results. Overall though, I think that I did the experiment well and I think that I got good and accurate results. Jake Gallop CW Draft Jake Gallop Bio coursework

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