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How the mass (in grams) of potato tissue changes when placed in varying concentrations of Sucrose.

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Introduction

Aim: The aim of this experiment is to find out how the mass (in grams) of potato tissue changes when placed in varying concentrations of Sucrose. Apparatus: Cutting tile - to cut the potato on Knife - to cut the potato Graduated pipette - to fill the bottles 25cm Measuring cylinder - to measure solutions Distilled water - to act as a control The following Sucrose solutions 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0 molar concentrations - to submerge potato tubes into. Potatoes - to cut up and test Tissue paper or cloth - to dry the excess surface water off prior to weighing the potato chips. Electronic Balance - to weigh the potato chips Cork borer - to cut out 33 identical potato cylinders 33 30ml bottles with lids - to hold potato chips and glucose solutions Planning: Prior to doing the actual experiment, I performed a few tests on a small number of potato chips to find out how long the chips should be left in the Sucrose solutions for. I found that after being left in distilled water for 10 minutes there had been no mass change, so I left the next one in for an hour and after weighing found that there head been little change. ...read more.

Middle

This is because, is the potato isn�t covered up by the solutions, the effect of osmosis might not occur to the fullest. Small things such as a dirty test tube, and a slightly cracked measuring cylinder could still affect the results, and therefore we will take these into account as well. Safety: Safety is an important aspect in every experiment, even if the experiment seems to be very harmless. And that is why we take this into consideration, no matter what. We will be using a very sharp knife, which could injure someone if it�s not handled properly. And we will also be careful that the solutions don�t get into our bodies internally, just in case, because we are not fully aware of the damage it could do to us. But other than that, there weren�t any bigger matters to be cautious of. Conclusion In this experiment, I believe that I have collected enough data to support my hypothesis. This investigation was, I think, successful. Successful meaning my results collaborated my predictions. The potato cells, working to stay alive, took in, or gave out the water depending on the concentration of the tissue, and the concentration of the solution it is surrounded in. ...read more.

Conclusion

That may of happened because that certain chip may have more water to release then the others, or 60% is the maximum amount that the potato tube can work best to decrease in mass. In trial 2 the last 2 results look weird. I think the reason for this is because my method was not good enough. When filling each of the test tubes with glucose, I did not use a measuring cylinder to measure the required amount. I just poured until the glucose solution covered half of the test tube. That may look same in all the test tubes but I might of added extra or less to it. To improve my method I would definitely use a measuring cylinder next time in order to receive a high standard of results. I would also improve the range of glucose concentration. Instead of it going in 20�s, I would prefer to have the glucose concentration in 10�s, up to 100. This way you have a vast variety of readings to look at. When I do another experiment I am going to plan my method in advance in order to be more organised, that way less inaccurate readings will happen and it will make everything run smoothly and efficiently. Overall I found this experiment challenging, educational and fun.????????????????? ...read more.

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