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Osmosis, Does glucose concentration affect mass and how?

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Ryan Kent -10SFH/10B1 Mr Nicholson Does glucose concentration affect mass and how? I was shown an example of Osmosis, which involved a potato chip and 5% glucose solution; we saw that as the glucose solution, was left with the potato given 24 hours, the potato had gained mass due to the glucose solution being more concentrated than the potato chip. Here is a scientifically correct definition of Osmosis. “Osmosis is the diffusion of water through a semi-permeable membrane, from a solution of low solute concentration (high water potential) to a solution with high solute concentration (low water potential).” This basically means that if the potato chip was placed in a solution more concentrated than its own it would shrivel up, and if it was placed in a solution less concentrated than itself it would simply expand and possibly burst. Weak ï Strong I used this as the basis for my investigation and decided to investigate what would happen with different concentrations and what the results would be specifically relating to the mass of the potato. So I decided to carry out a preliminary test for my investigation to help me decide what the constants and variables will be, so first I needed a strategy. ...read more.


1 To measure the solution accurately. Board & Scalpel 1 To cut up potato chips. I have chosen to use beakers not conical flasks as getting the potato chips out of the flash without causing breakages at the end would be nigh on impossible and then to accurately get results like length could easily be affected. I chose to use 40ml of solution as it covers the potato chips fully and is a reasonable amount without extra unnecessary solution. I thought it would be a good idea on how to better evaluate my test like showing a step by step plan on my procedure and provide justification of doing so. Label 5 Beakers with solution names and my initials (for easy recognition). Measure and add 40ml of the correct solution into each beaker. Then measure and weigh potato chips, weight must be within 0.05g of 0.9g Take note of solution chips added to, and then leave for approx 24 hours. Real Test The next stage of the investigation was to complete the actual test, using the above plan and modifications here are the results below. I needed to ensure this was going to stay a fair test so I needed to accurately measure the solution and potato chips each time, as if not done properly or written down incorrectly it could affect my results. ...read more.


So we can see that 10% is probably a similar percentage of concentration of that in the potato cell. Evaluation I believe there could be alternative ways to collect the data I collected by maybe looking at a smaller mass of potato chip and only giving it a few hours for osmosis to happen. There have been limitations to my conclusion due to the fact I didn?t have time to repeat the experiment. Possibly I could have placed two potato chips in each solution to save time, and maybe dye the second one a different colour possible using red cabbage juice or food colouring. The evidence was gathered fairly, with the chips being in the solution the same amount of time, time same amount of solution, and accurate readings, weighing & use of sophisticated equipment including eyesight, so I would believe the data is pretty reliable. We did have one anomaly but the test was repeated and a new result taken. To help make the data more secure we should have taken measurement of maybe the density of the potato chips or volume of it to help picture the change in mass. But the all results were precisely measured so the data should be reliable & secure. Permission to use their data was kindly granted by Laura Barker. ...read more.

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