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The aim of this investigation is to examine the difference in the mass of potato after keeping the in sugar solutions of different concentrations for 24 hours. The water potential will also be calculated.

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Introduction

How does the concentration of a sugar solution affect the mass of a potato? By: Joonatan Salo Introduction: The aim of this investigation is to examine the difference in the mass of potato after keeping the in sugar solutions of different concentrations for 24 hours. The water potential will also be calculated. Research Question: How does the concentration of a sugar solution affect on the mass of a potato? Hypothesis: The larger the concentration of the sugar solution, the smaller the mass of the potato will be, as water moves to a concentration where there is less water molecules. Variables: Independent: Concentration of sugar solution Dependent: Final mass or change in mass of potato Controlled: The concentrations of the sugar solutions, temperature, ???? List of apparatus and materials: Controlling the controlled variables: List of Apparatus: - Lab Quest - Four potato cores - 250ML Beaker - 0M, 0,33M, 0,67M, 1,0M sugar solutions - A scale (kg +/- 0,001 kg) ...read more.

Middle

+/- 0.001 kg Percentage change (%) 0.00M 28.96 14.49 0.33M -31.23 -5.21 0.67M -143.07 -35.77 1.00M -126.06 -31.51 Processing of data: y = -50,547x + 10,774, Correlation = 0,8542 Calculations: Sugar molar concentration: The sugar molar concentration is used to calculate the solute potential of the sugar solution: bars With the solute potential calculated it is possible to calculate the water potential using the formula: -Pressure potential is zero, because the solution is at equilibrium Results: Sugar molar concentration: 0.213 Solute potential: -5.268 bars Water potential: -5.268 Conclusion: The results presented in the graph and table 2.0 show that the sugar solutions with higher concentration of sugar also had a bigger percentage decrease in the mass of the potato cores. The solutions 0.67M and 1.00M experienced a significantly larger percentage change, as the 0.67M solution decreased 35.77% and the 1.00M 31.51%. The mass of the potatoes cores in the 0.33M sugar solution decreased only by 5.21% and the solution with 0.0M sugar concentration caused the mass of the potatoes to increase by 14.49%. ...read more.

Conclusion

Evaluation: The investigation was quite successful as the best fit line of the graph shows a result that is believable. The only thing that didn't go according to the hypothesis, was the percent decrease of mass in 0.67M solution being higher than 1.0M. The difference of percentage change between the two solutions was not however very big. Hence there could have been some kind of error in the results obtained by the class. Otherwise the investigation seemed to be successful. All the variables that could be controlled were controlled, e.g. keeping temperature constant. There was uncertainty present in the experiment, as the uncertainty of the balance was +/- 0.001kg, the beaker had an uncertainty of +/- 5 ML and the thermometer was an uncertainty of +/- 2 C. These uncertainties are however so small that they have very little effect and are insignificant to the outcome of the investigation. Improvements: The experiment could have been performed several times more to get a better and more accurate average of results. ...read more.

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