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# Osmosis Howthe concentration of solution affects the weight of a potato chip

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Introduction

Osmosis How the concentration of solution affects the weight of a potato chip Aim-To find out how the concentration of salt solution affects the weight of the potato chip. Prediction-I predict the solutions with a low concentration of salt will gain more weight because Osmosis will occur. Osmosis is a special kind of diffusion it is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. The partially permeable membrane allows the passage of water molecules but not solute molecules because it has tiny holes in so only water molecules can fit through. I also think this because in a plant cell when it is surrounded by pure water it will get bigger and when a plant cell is surrounded by a strong sugar solution the cytoplasm shrinks and the cells cant support the plant anymore making it decrease in weight and size I think this will also happen to the potato chip. ...read more.

Middle

2.0 1.00 0.97 1.5 1.00 0.99 1.0 1.00 1.2 0.5 1.00 1.2 0 1.00 1.3 Method- > Cut and weigh 5 potato chips to the mass of 1.0 g > Measure the 2 molar salt solution and water as shown in the table below > Leave the potato chips in the 5 different test tubes of salt solutions for 15 minutes > Weigh the potato chips > Repeat experiment again Concentration of 2 molar salt solution (ml) pure water (ml) 2.0 0 1.5 0.5 1.0 1.0 0.5 1.5 0 2.0 Fair test-To make this investigation a fair test I kept the weight of the potato chips the same, time the potato chips were left in the 5 different salt solutions and the same 2 molar salt solution. Results- Concentration (ml) of 2 molar salt solution Weight of potato (g) Weight of potato after 15 minutes Difference of weight (g) 1st experiment 2nd experiment 2.0 1.0 0.96 0.97 0.03 1.5 1.0 0.99 0.99 0.01 1.0 1.0 1.02 1.01 -0.01 0.5 1.0 1.03 1.03 -0.03 0 1.0 1.05 1.04 -0.04 Conclusion-My results show me my prediction was correct because osmosis occurred. ...read more.

Conclusion

Another inaccuracy was when I put the potato chips into the solutions, because it was impossible to not leave a small interval between each test tube. The first test would have been going for a few seconds longer than the last. To resolve this problem the people in my group could have all got a potato chip and put them in at the same time to make it more accurate. To improve this investigation I could use potato chips with a larger mass, change the time the potato chips were in the solutions for and change the 2 molar salt solutions to give me a more accurate and wider range of results. I think my results are fairly accurate because we weighed the potato chips on a scale which gave an accurate measurement and on the graph the points plotted are close to the line of best fit. To extend this investigation further I could concentrate on a smaller range of concentrations around the point (on my graph) where there is no change in mass, to find the precise concentration that causes no change in mass. Rachel walker ...read more.

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