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My aim is to investigate what effect differing concentrations of sucrose solutions have on Osmosis in raw potato chips.

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Introduction

A science investigation about Osmosis in potato chips. Imad Uddin 11H / 11-1 AIM My aim is to investigate what effect differing concentrations of sucrose solutions have on Osmosis in raw potato chips. This investigation is to determine how the mass of a raw potato chip is affected, by being immersed in different concentrations of a sucrose in water solution, due to the process of Osmosis. Prediction Osmosis is defined as `the movement of water molecules from an area of high water concentration to an area of low water concentration, across a semi-permeable membrane' (Collins, 1999) My prediction is that in a high concentration of water the amount of solute (e.g. sucrose) is low. This could be called a weak or dilute solution. In a low concentration of water the amount of solute (e.g. sucrose) is high. This could be called a strong or concentrated solution. I predict that when two such solutions are divided by a semi-permeable membrane the water molecules will move from the area of high concentration to the area of low concentration, until both sides of the membrane are of equal osmotic pressure i.e. isotonic. This can be seen in living cells. The cell membrane in cells is semi-permeable and the vacuole contains a sugar solution. So, when a cell is placed in distilled water, water molecules will move across the semi-permeable into the cell by Osmosis, making the cell swell. ...read more.

Middle

This time we left them for 10 minutes and saw that the results we collected were much easier to compare because there was more of a range. Safety Safety is a very important part of all experiment done in the laboratory. The things that you will need to do to keep your experiment a safe one for yourself and other students around you are as follows: � OBEY ALL LABORATORY RULES � Take care in using glassware since it is sharp when broken and can cut skin. � Take care when returning all glassware and equipment at the end of the experiment. � Wash all your equipment after your experiment. � Don't leave any thing lying around (e.g. Boiling tube Bench on the table, it might roll off). � Make sure all the boiling tubes are in the rack. � Listen to all instructions that are given. � Use the knife carefully to cut the pieces of raw potato to accurate size. (Do not mess around with the knife, as it is very dangerous). Fair test To ensure that the experiment is done fairly I will consider the following factors: � Make sure the raw potato pieces are all of equal lengths (3 cm) and diameter (1 cm). � All three experiments are done together so all are done fairly under the same conditions. ...read more.

Conclusion

26. After you have recoded the results of the mass before and after for all of them, work out the change and then work out the average. 27. Record the results on a graph. Concentration Of sucrose Test tube Mass of raw potato chip before placed in sucrose Mass of raw potato chip after placed in sucrose for 10min Changes in mass / differences Average 1 1 4.86 4.67 -0.19 1 2 4.82 4.66 -0.16 -0.196 1 3 4.85 4.61 -0.24 0.8 1 4.56 4.35 -0.21 0.8 2 4.57 4.42 -0.15 -0.193 0.8 3 4.83 4.61 -0.22 0.6 1 4.63 4.44 -0.19 0.6 2 4.68 4.55 -0.13 -0.18 0.6 3 4.84 4.62 -0.22 0.4 1 4.86 4.75 -0.11 0.4 2 4.88 4.72 -0.16 -0.143 0.4 3 4.89 4.73 -0.16 0.2 1 4.59 4.56 -0.03 0.2 2 4.87 4.82 -0.05 -0.053 0.2 3 4.56 4.48 -0.08 0 1 4.78 4.81 -0.03 0 2 4.83 4.84 -0.01 0.02 0 3 4.77 4.79 -0.02 My Results To give me the average mass of the raw potato chip I deducted the result from the third column with the second column. My results show me that as the concentration of sucrose increased the mass of the of the raw potato piece decreased. As you can see when the concentration level is at its highest (1 molar) the mass has averagely decreased by 0.196 (a decrease in mass by %). I will produce a graph from this result. Analysing of results ...read more.

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