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To find out if Osmosis occurs in a Potato, and how it affects the potato in different molar solutions of Sugar and Water

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Introduction

AIM: To find out if Osmosis occurs in a Potato, and how it affects the potato in different molar solutions of Sugar and Water SCIENTIFIC KNOWLEDGE - Osmosis is the movement of water molecules from an area of high water concentration to an area of low concentration, through a semi-permeable membrane. Concentrations can be described in different ways; the important thing to remember is that there is a difference in concentration (a concentration gradient) for osmosis to happen. Water moves so that the concentration is the same (equal) on both sides of the membrane. Low Water Concentration Semi Permeable High Water Concentration High Sugar Solution Membrane Low Sugar Concentration Concentrated Concentration Dilute Concentration PERLIMINARY EXPERIMENT - Just before we started the main experiment we had done smaller experiments to determine what concentration would be best to use. Prediction - I predict that the 10cm3 water in the visking tube will diffuse into the sugar solution leaving the visking tube empty. I am also predicting that the visking tube with the sugar solution will expand. Equipment - 2 Visking tubes 2 Beakers Sugar Cubes Water Method - Dissolve the sugar cube in some water. ...read more.

Middle

I believe that the weight and the size of the potato won't be altered much. FAIR TEST- In this experiment we will only change one factor, the concentration of the solution, and the factors that I am going to keep the same are as follows: We must keep the length and weight of the Potato exactly the same. A small difference could end up with anonymous results. I will be doing by using the same cork borer and measuring the length exactly and double-checking them. I must use the same cork borer because changing it would change the diameter causing the results to be inaccurate. I also have to make sure that the whole potato is covered by the solution otherwise only part of the substance will diffuse. I must also make sure than when making the solution, the total adds up exactly the same as the others and that it is very accurate because small difference between the concentrations will make anonymous results. I will have to keep the room temperature warm enough for the solution not to evaporate. This could cause wrong results. ...read more.

Conclusion

Change in mass (g) 0.0 2.5 3.0 +5 0.1 2.5 2.6 +1 0.2 2.5 2.7 +2 0.3 2.5 2.4 -1 0.4 2.5 2.8 +3 0.5 2.5 2.7 +2 0.6 2.5 2.5 0 0.7 2.5 2.1 -4 0.8 2.5 2.2 -3 0.9 2.5 1.8 -7 1.0 2.5 1.5 -10 I randomly picked a concentration and from that I determined to do that and the next three concentrations in sequence. Experiment 3 Concentration of Sugar (M) Mass at start (g) Mass at end (g) Length at start (mm) Length at end (mm) 0.2 2.2 2.1 20 20 0.2 2.1 2.2 20 20 0.2 2.0 2.2 20 21 0.3 2.0 2.0 20 22 0.3 2.1 2.2 20 21 0.3 2.1 1.5 20 20 0.4 2.1 1.0 20 19 0.4 2.1 1.7 20 20 0.4 2.2 1.7 20 20 0.5 2.1 1.5 20 20 0.5 2.1 1.4 20 18 0.5 2.0 1.7 20 18 Concentration of Sugar (M) Average Mass at start (g) Average Mass at end (g) Average Length at start (mm) Average Length at end (mm) 0.2 2.1 2.2 20 20 0.3 2.1 1.9 20 21 0.4 2.1 1.5 20 20 0.5 2.1 1.5 20 19 Concentration of Sugar (M) Change in Weight (g) Change in Length (mm) 0.2 +0.1 0 0.3 -0.2 +1 0.4 -0.6 0 0.5 -0.6 -1 JOTSAROOP VIRDEE 11 YELLOW ...read more.

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