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Investigation into the effect of sucrose concentration on osmosis in potato chips.

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Introduction

Investigation into the effect of sucrose concentration on osmosis in potato chips PLAN I have been asked to investigate the effect of osmosis on potato chips. Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low concentration. There are different variables that effect osmosis. They are listed and explained below: ? Mass of potatoes ~ the mass is very important because the bigger and heavier the potato chip, the longer it will take osmosis to occur. If the size of the potato chip varies, so will the amount of mass it loses or gains. The potato chip will be measured before it is put in solution, and after it has been taken out. This will let me see how much osmosis has taken place. ? Concentration of sucrose solution ~ the stronger the solution, the quicker osmosis occurs. More osmosis will occur out of the chip. Because I am investigating different sucrose concentrations, I am going to put the potato chips in different concentrations. These concentrations will be 0m, 0.2m, 0.4m, 0.6m, 0.8m, and 1m. ? Time ~ the longer you have the potato chips in solution, the better, because more osmosis can occur. If you take the chips out after a few minutes, nothing is likely to have happened. This is why the time is important. More or less solution gets absorbed depending on the time. I will be keeping my potato chips in for forty minutes so that it gives me good results. ...read more.

Middle

� Then, I will measured each chip (in mass) and write down the measurements in a table like the one above. While doing this, I will measure and record the room temperature. � I will get a stopwatch ready and drop the chips, (one in each tube) and start the timer. I plan to leave the chips for 40 minutes in the boiler tubes. � After the whole 40 minutes have gone, I will remove the chips from the boiler tubes, take off the surface solution with a paper towel, and then I'll weigh the chips making sure the scale reads 0.0g before I start - each time. � I will do the experiment twice because I want to get the averages and I want to reduce the effect of anomalous results. I think that this will be a fair test because I think I have thought of every possible variable and I will everything I can to make it as fair a test as I can. I will try to get the chips to go in and come out of the tubes at the same time. For safety measures, I will wear a lab coat, wear safety goggles, and tie my scarf back. I will make sure I use equipment properly and not mess about with dangerous equipment that could cause accidents i.e. Scalpul. OBTAINING EVIDENCE All the potato chips are 4cm and 5mm. They were all kept in solution for 40 minutes. The results were as follows: First experiment: room temperature 20�C Molarity (m) ...read more.

Conclusion

If I had cut the potato into doughnuts, I would have only been using the out side of the potato, leaving out the middle. My results did lie close to my line of best fit, and for that reason, they were quite accurate, but if I was doing the experiment, again I could make some other changes, some which are mentioned above. I could also use a burette to measure my solutions. This would ensure that I have an accurate amount of solution in each test tube. I could also weigh each chip on a more accurate scale, e.g. not to 0.00g but to 0.000g. I did not get any anomalous results, but some results were not as close to the line as others were. This could have been caused by one of my six results not being accurate, it could changed the average by a lot. Alternatively, perhaps the potato chips were not cut accurately, or on that part of the potato, the cells did not loose or gain mass as good. My results did differ a lot for the same concentration. I realised that different parts of the potato may not have been the same because chips of the same width and length were not the same weight. My results were reliable and none were ignored. I could make my request for information, bigger by testing the change in mass with molarity by using something else like another vegetable, i.e. cucumber or carrots. Then I could see if osmosis occurs with the same patterns with any vegetable. 1 Sonya Shannon - Uddin - 10 Yamama - May 2002 ...read more.

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