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# What is the effect of solutions with different concentrations on water balance in potato cells

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Introduction

Initial plan I am going to investigate the effect of different concentrations of sucrose solutions on water balance in potato cells. Hypothesis From my knowledge of osmosis theory I predict that more dilute sucrose solutions will cause the greatest gain in mass in the potatoes because they will take on most water. Osmosis theory Overall flow of water molecules Factors that could affect the water balance * The concentration of sucrose in the solution which the cell is placed in * The volume of solution * The number of cells (mass of potato) * The surface area of the cells (surface area of potato) * The type of cell The factor that I am going to change (the independent variable) will be the concentration of sucrose in the solution which the potato is in. I will measure the affect of this on the change in mass of the potato (the dependent variable). I will control the other factors (control variables) that I have listed so that they are constant for every experiment to make sure that they do not affect the dependent variable. I will use a fixed volume of solution for every experiment, a fixed size of potato chip and a fixed shape of potato chip. ...read more.

Middle

0 Red 4.42 5.61 +1.19 +26.92 Green 4.47 5.49 +1.02 +22.82 Yellow 4.40 5.45 +1.05 +23.86 Blue 4.10 4.99 +0.89 +21.71 24 Red 4.62 5.02 +0.40 +8.66 Green 4.30 4.62 +0.32 +7.44 Yellow 4.25 4.56 +0.31 +7.29 Blue 4.22 4.64 +0.42 +9.95 48 Red 4.43 4.45 +0.02 +0.45 Green 4.10 4.02 -0.08 -1.95 Yellow 3.82 3.75 -0.07 -1.83 Blue 4.16 4.15 -0.01 -0.24 60 Red 4.41 3.97 -0.44 -9.98 Green 4.27 3.81 -0.46 -10.77 Yellow 4.24 3.72 -0.52 -12.26 Blue 4.37 3.96 -0.41 -9.38 72 Red 4.52 3.76 -0.76 -16.81 Green 4.08 3.33 -0.75 -18.38 Yellow 4.53 3.71 -0.82 -18.10 Blue 4.43 3.59 -0.84 -18.96 96 Red 4.40 3.33 -1.07 -24.32 Green 4.02 3.07 -0.95 -23.63 Yellow 4.28 3.10 -1.18 -27.57 Blue 4.43 3.41 -1.02 -23.02 120 Red 4.48 3.10 -1.38 -30.80 Green 4.05 3.10 -0.95 -23.46 Yellow 4.08 3.05 -1.08 -26.47 Blue 4.05 3.03 -1.02 -25.19 The two results that are bold and underlined are so far outside the range of the other results that they are considered to be outliers. I will not include them in my calculations of the mean, as they would distort the results. Calculation of means and ranges Concentration of sucrose in 120cm3 solution /cm3 Mean % change in mass Highest % change in mass Lowest % change in mass 0 ...read more.

Conclusion

I could also do more repeats because this would have made my conclusion more reliable. I could experiment with a greater number of different concentrations of sucrose solution to confirm the trend in the data. I could carry out the whole experiment myself as working in a large group could have brought about variations in the method, which might have had a slight effect on the results. If I did it myself I could make sure that everything is done in exactly the same way for every experiment, which would make the data more reliable. Evaluating my conclusion I am pretty confident in my conclusion because, as I have previously discussed, my results seem to be fairly accurate and reliable, which gives me more confidence in the conclusion drawn from them. The seemingly anomalous result for the final concentration does, however, cast a slight doubt on the reliability of the conclusion, so I would like to repeat the experiment for that concentration to verify the conclusion. To boost my confidence in my conclusion I could repeat the whole experiment with the improvements that I outlined earlier, but for now I believe that my conclusion is fairly accurate and I would say that I have confidence in the general conclusion, if not every result. ?? ?? ?? ?? What is the effect of solutions with different concentrations on water balance in potato cells? 1 ...read more.

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