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To Investigate the Effect of Osmosis on Equal Length Potatoes

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To Investigate the Effect of Osmosis on Equal Length Potatoes Aim The aim of this experiment is to measure the loss of sugar (sucrose) from potatoes, which have been affected by Osmosis. In this experiment, I have Dependent and Independent variables. My dependent variables will be; * Type of potatoes * Mass of potatoes * Length of potatoes * Time left in Sucrose solution My Independent variable will be; * Molar amount Background Information Osmosis is the net movement of water across a selectively permeable membrane driven by a difference in solute concentrations on the two sides of the membrane. A selectively permeable membrane is one that allows unrestricted passage of water, but not solute molecules or ions. Different concentrations of solute molecules lead to different concentrations of free water molecules on either side of the membrane. On the side of the membrane with higher free water concentration (i.e. a lower concentration of solute), more water molecules will strike the pores in the membrane in a give interval of time. More strikes equates to more molecules passing through the pores, which in turn results in net diffusion of water from the compartment with high concentration of free water to that with low concentration of free water. ...read more.


* Measure the end results carefully. Fair Testing is also very important in this experiment; I shall do the following to make the experiment and testing fair; * Keep all the potatoes the same length at the beginning * Keep the varying Molars accurate * Reset the mass scale each time a new potato is weighed * Use the same distilled water * Use the same sucrose * Use the same type of potato. Method First of all, I shall get 5 test tubes and put them in 1 test tube holder. After that is done I will put varying concentration of sucrose in each test tube going from 0M to 1M. I shall get the varying molars by mixing the sucrose with distilled water. After this, I shall get 5 cylindrical potatoes and cut them into equal lengths of 4cm. Once I have done this, I will measure each potato and make sure their mass seems right. Next, I will drop each potato into each potato at the same time exactly and then start the stop clock for 25 minutes. Now I wait. Once the 25 minutes is up, I take each potato out the test tube and measure its new mass. ...read more.


My Method went perfectly according to plan as I did exactly everything I mentioned. One of the main problems in the evidence I got, was that I only did the experiment for 25 minutes instead of 30minutes as I kept running behind schedule. When it comes to my fair testing, that went overall according to plan, except that not all the potatoes were exactly 4cm, as some were 3.9cm and others were 4.1cm. The reason this happened is because it was extremely difficult to measure the cylindrical potatoes and get them exact. Overall I believe my experiment went according to plan and I also believe my evidence and results were good. When it comes to things I could improve, I could repeat each experiment 3 times again but for 30 minutes and see if my results would be any different. Also I could try as hard as I can to get every potato piece at 4.00cm on the dot. Conclusion In conclusion of this experiment, I have learnt a lot of background information on Osmosis and I have also learnt that Osmosis can occur in potatoes as I hope my investigation has proven. The final thing I have learnt is that as the concentration of Sucrose increases, the percentage change of the mass of the potatoes decrease and vice versa. Final Conclusion In my final conclusion of Osmosis, I have learnt a great deal about Sucrose, potatoes and Osmosis. ...read more.

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