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Biology Osmosis Plan

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Plan In this experiment, I will investigate the concentration inside a potato cell; through the process of Osmosis. This is the movement of water down its concentration gradient across a living cell membrane. Using certain concentrations of sucrose and water, I will discover, further, the concentration of sugar within a potato. To begin with, I will do a preliminary test. This will be to see the general outcome. Then I will note down the results and compare them with the actual results that I will do a week later. The variables in this experiment are: * Temperature should be controlled as osmosis works faster in higher temperature. I will keep the temperature the same at all times. I will therefore be doing all the experiment in one day, at one hour. * Surface area of the potato chip. This will need to be controlled as the different sizes may have different concentrations and will be an unfair test. To ensure this I will use the same size borer as the borers are of different sizes. I will also choose relatively same size potatoes. * Concentration of sucrose, which is the dependent variable in this experiment. This will be altered in order to complete the experiment. * Timing for experiment, if longer then I should expect to see a different mass change. ...read more.


I will take my potato chips and measure them using the measuring scale. I will make sure that each potato chip is the same mass as the others. If not I will cut them down to make sure that it is. 4) From this, I will go on to pouring the 20cm3 of sucrose into test tube 1. Then I will label this test tube, (using a marker pen and stickers) 1.0M. 5) Following this, I will go on to measure 15cm3 of sucrose and 5cm3 of distilled water using the measuring cylinder. I will pour each solvent into the test tube 2, and label this test tube as 0.75M. 6) From here I will measure 10cm3 of sucrose and 10 cm3 of distilled water, I will then pour these liquids into test tube 3, and once again label it as 0.5M 7) After doing that, I will measure 5cm3 of sucrose and 15cm3 of distilled water. Then I will label this test tube as 0.25M. 8) I will then measure 20cm3 of distilled water in the measuring cylinder and I will pour this into the test tube 5, and I will label it as 0M. 9) After this is complete, I will have my measurements and my chips, so all that will be left to do is to put the chips in the test tubes. ...read more.


Therefore, I think that by using extra persons then the experiment could have been more precise and accurate. In my experiment, there was only one anomaly and it was due to not drying out the potato properly and wiping the scale clean of the solution. To investigate further I would take different size potatoes with different masses but still using the same sucrose concentrations. This would prove the Osmosis theory further. As well as this I would also be inclined to try out a different potato and see the theory in that case, different potato in the sense of a different brand or a different make. This would be an interesting view at Osmosis. Other than that, I would also be interested if a new sugar concentration was introduced. This way I could find out if the theory works with different sugars and different potatoes. I would also investigate by trying the experiments in more detail. Using higher technology and more advanced equipment, to measure and to add concentrations. This would provide additional evidence to the Osmosis theory. Conclusion In an overall aspect my experiment was done with precision and accuracy. I have learnt that Osmosis is the theory that states a less concentrated will move to a higher concentrated solution. With the aid of further technology I think that the experiment could have been done more specifically. ?? ?? ?? ?? Biology Coursework Concentration inside a potato cell ...read more.

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