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In this investigation I will observe the effect a concentrated sugar solution has on the rate of osmosis in a plant. The vegetable I have chosen for this experiment is a potato.

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Introduction

Osmosis Investigation In this investigation I will observe the effect a concentrated sugar solution has on the rate of osmosis in a plant. The vegetable I have chosen for this experiment is a potato. I have soaked them in several concentrations of sucrose, firstly 0.2, 0.4 and 0.6and then the class concentrations of 0.2, 0.3, 0.35, 0.4, 0.5 and 0.6. These are the results I will analyse. Hopefully using this method I will be bale to observe osmosis at work. Osmosis is the diffusion of water from a region on which they are in a high concentration to a region where the water molecules have a low concentration. They diffuse through a semi-permeable surface, the potato has a semi-permeable surface making it ideal to use. Equipment Potatoes Boiling Tubes Weighing Scales Ruler Varying Concentrations of Sucrose Water Potato Borer Method: 1. Use the potato borer to cut several 2cm long cylinder shaped pieces of potato. 2. Record the weight and length of the pieces. 3. Soak the potato pieces in the concentrations of sucrose (0.2, 0.3, 0.35, 0.4, 0.5, 0.6 and water) ...read more.

Middle

Diagram Here This diagram explains the experiment we are carrying out, when the solution outside the cell has a greater concentration than the cell inside. Solution Trial Before After Change %Change Av. % Change Water 1 2 3 20 20 20 22 20 21 2 0 1 10% 0% 5% 5% Sucrose 0.2M 1 2 3 20 20 20 22 22 21 2 2 1 10% 10% 5% 8.3% 0.4M 1 2 3 20 20 20 21 22 20 1 2 0 5% 10% 0% 5% 0.6M 1 2 3 20 20 20 17 14 16 -3 -6 -4 -15% -30% -20% -21.6% After obtaining these results I realised they weren't good enough and I hadn't enough time to record and obtain all the sucrose solutions I said I would investigate. So from now on I will be using the results I obtained in class to analyse and plot up my graph. Analysis Our results show that as the concentration of the sucrose solution increased the smaller the potato chips got. ...read more.

Conclusion

The point we should take into consideration are:- * Firstly we should take numerous tests to find a more accurate average * Use more and wider range of sucrose solutions * We did not take the potato chips out at the same time allowing some chips more time in the sucrose; this could have affected the results. We should have done each test one at a time to give us a more fair result. * Although estimating the osmotic potential was ok for this investigation, it would have been better and more scientific to work it out properly. The two point the lines of best fit crossed in the graph were 0.28 - 0.33, the range = 0.05 so the point exactly in the middle is 0.28 + 1/2 of 0.05, which is 0.28 + 0.025 = 0.305, so I was right the first time. Other areas we could investigate could be to select a different root vegetable such as an onion, we could vary the sucrose solution concentration these are all possibilities, simply vary the variables. Overall I believe the investigation went vary well, proving what we were Investigating. ...read more.

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