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Investigate the effect of the strength of a solution on how much water moves in to or out of a potato chip.

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Investigate the effect of the strength of a solution on how much water moves in to or out of a potato chip. By Victoria Wright, 11T. In this investigation, I am going to investigate the effect of different strength solutions on how much water moves in to or out of a potato chip. The variables involved in this investigation are: * Strength of the solution * Volume of the solution * Mass of potato chip * Length and width of potato chip * My input variable in this investigation will be the strength of the solution, in which the potato chips will be placed. By changing this variable, I will see the effect of different strength solutions on how much water goes in to or out of a potato chip, through the process of osmosis. Osmosis is the diffusion of water particles from a region of high water concentration or a dilute solution to a region of low water concentration, a concentrated solution through a selectively permeable membrane. Osmosis occurs because a selectively permeable membrane is a structure perforated with minute pores large enough to allow the passage of small molecules such as water, but to small to allow the passage of larger molecules such as salts and sugars. Therefore, it acts like a molecular sieve. The diagram below shows what happens during osmosis. Prediction. Due to what happens during the process of osmosis I predict that the higher the water concentration, the weaker the solution; therfore, the larger the voloume of water that will from the beaker into the vacuoles of the chip's cells. So, consequently the stronger the soloution the larger the volume of water that will move out of the chip's cells into the beaker. Osmosis is the movement of water molecules from an area of high water concentration to an area of low water concentration through a semi permeable membrane, and osmosis is a vital device in the transport of fluids in living organisms, for example, in the transport of water from the soil to the roots in plants. ...read more.


preliminary results I can now say in this investigation the input variable I will be changing is the strength of the solutions in which the potato chips are placed. I will be using a 10ml-measuring cylinder to measure out the different solutions using my calculations above. My weakest solution will be zero molar, therefore just pure distilled water, and my strongest will be a one molar solution. In all I will take five different weights for the change in mass of the chips at, 1 molar, 0.75 molar, 0.5 molar, 0.25 molar and 0 molar. Hence, It can be seen that each solution increases or decreases in strength by 25%. I will do this investigation with three potato chips in each solution, so it can be seen if the same thing happens to each chip at that strength solution. The outcome variable in this investigation is the change in mass of the potato chips, which I will measure using a digital weighing scale correct to one decimal place to give me accurate results. The apparatus I will be using in this experiment are: * 5 Boiling tubes * A test tube rack * Weighing Scale correct to one decimal place. * One molar sugar solution, which I will change to different strength by adding, distilled water. * A potato * Watch * 10ml measuring cylinder * Scalpel * A potato corer to cut cylinders out of the potato, therefore all the chips will be the same width and would just need to be cut to length and also the potato will not have to be pealed as the corer takes the potato from the inside. Safety and Precautions. * To keep all of the different variables that I am not changing or measuring the same, to make sure that none of them affect the results of the experiment in any way. * Whilst cutting the potato, extreme care and precaution has to be taken with the scalpel as it is very sharp and could easily cause a serious wound. ...read more.


* I would use bigger potato chips as the ones I used were very small to begin with, so if I used bigger chips the change in masses would have been more spread out. To Further My Enquiry A further investigation I that I would carry out would be similar to this one, I would investigate the effect of temperature on osmosis. To carry out this investigation I would firstly do the investigation I did with different strength solutions and measuring the change in mass but this time only with one molar and zero molar, so I could have the two extreme solutions. In the investigation I just carried out the solutions were at 21oc. I would then measure out the solutions again but raise the temperature of the solutions by 10oc, I would do this another twice more and lower the temperature of one solution, so I would see the effect of temperature on osmosis at five different temperatures, 11, 21, 31, 41, 51oc. I would increase the temperature by putting the boiling tubes with the solutions in, in a water bath and decrease the temperature by placing the boiling tubes either in ice or a water bath set at 10oc. My prediction for this investigation would be that as I increase the temperature the less osmosis will occur, resulting little if any change in mass. This is because the heat will kill the cells in the chip and break down the semi-permeable membranes. I could also do an investigation where I would use five different potatoes and see the effect they have on osmosis. I would set up the investigation like in this investigation and repeat it five times each time using different potatoes. I predict that the cells in different potatoes would have different concentrations of water molecules in vacuoles of their cells this would affect the change in mass at different strength solutions in the investigation. ...read more.

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