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To find if the concentration of the external solution affects osmosis in plant tissue.

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Introduction

Aim- To find if the concentration of the external solution affects osmosis in plant tissue. I will be investigating how molrality of a salt solution affects the mass and length of potato chips during osmosis. Background information. Osmosis is a special kind of diffusion involving the movement of water molecules. Water molecules are small and can pass easily through a particularly permeable membrane that will prevent the movement of larger molecules. This special kind of diffusion only occurs when a partially permable membrane seperates two solutions. So osmosis is the movement of water through a partially permable membrane from a region of high water concentration to a region of lower water concentration. The water is said to move down a concentration gradient. Preliminary work Aim- To find if the concentration of the external solution affects osmosis in plant tissue. I will be investigating how morality of a salt solution affects the mass and length of potato chips during osmosis. I am going to put potato chips into a solution of 0m water (distilled water) and 2m solution. ...read more.

Middle

I feel my preliminary work helped me to understand this practical before I did my main piece and it helped with my overall work. It helped because it is a smaller version of the main one, and helped me understand the experiment better. Method I will start of by gathering the following equipment: Cork borer, Chopping board, Measuring cylinder, ruler, boiling tubes, test tube rack, scalpel, 0M and salt solution, 2M salt solution, cutting board, goggles, potato, scales, ruler. I will then cut out 6 potato chips, using the cork borer. I will measure them, using a ruler they will all be 4cm in length. I shall then weigh them, using the scales, recording my results. I shall then place them in the 6 solutions of: 0M, 0.2M, 0.4M, 0.6M, 0.8M and a 1M. I will make these using a 1M and a 2M, and mix them to there appropriate Morality's. They will all have 20ml of solution. I will leave them for 24 hours, when I come back the following day I shall take them out, dry off any excess water and I will measure, and weigh them; I will then record my finding and make a graph, I will show my percentage change. ...read more.

Conclusion

Results These are the results from my experiment; they are the averages from 3 experiments. I repeated them 3 times to get a better more accurate score, if I only did one or 2 they could vary slightly, but I think 3 is a good amount to average at. Bellow is the length, and then mass. Length Solution Before After 0M 4cm 4.1cm 0.2M 4cm 3.8cm 0.4M 4cm 3.7cm 0.6M 4cm 3.6cm 0.8M 4cm 3.4cm 1M 4cm 3.1cm Mass Solution Before After 0M 3.1g 3.8g 0.2M 3.2g 3.6g 0.4M 3.4g 3g 0.6M 3.2g 2.7g 0.8M 3.3g 2.7g 1M 3g 2.5g Conclusion My results show that I was right in my hypothesis. The results are accurate and steady, with no glitches. I am happy with this experiment, the only thing I would change next time is the amount of solutions I used and times I used repeated them, it was hard recording all the results and they could easily be lost or got wrong. I had no problems whilst doing it, and would be confident doing a similar thing another time. ...read more.

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