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GCSE Biology Osmosis Coursework

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Introduction

GCSE Biology Osmosis Coursework Introduction Osmosis is the movement of water molecules from a week solution to a strong solution through a semi-permeable membrane. The key factors of osmosis are concentration, surface area and temperature. In my experiments I will be changing the concentration of the water. Aim To investigate what speeds up the rate of Osmosis. Preliminary Work In my preliminary tests I started by setting up the apparatus as in the diagram above, then I started to gather results from the preliminary experiments. Concentration (M) Mass before (g) Mass after (g) 0.0 pure water 0.67 0.74 0.25 0.8 0.87 0.5 0.7 0.84 1.0 1.08 1.09 From these results I will make up a method that will show better results in my experiment. I have also decided that I will use smaller concentrations in my experiment and will do each test twice, this is so that I have a better chance of good results. Planning Method For my experiment I will need to cut a bit of potato into near equal sized chips with a near equal mass, and then I will put ...read more.

Middle

Whereas when the concentration is in the middle strength region, 0.3, 0.4, then the chips will start to keep the same weight because the sucrose concentration will star to equal out. Also I think that when the concentration is high, 0.5, the chips will start to loose weight because the sucrose concentration will be higher out side of the chip. I think that the texture and strength of the chips will change as well; I think that when the concentration is low that the chips will stay strong or get stronger due to gaining mass, then when the concentration is In the middle then the chips will get softer and when the chip is in high concentration the chip will be soft and flexible. I think that when the concentration is the lowest then the speed of osmosis will be at its fastest because the concentration outside the chip will be weaker than inside the chip allowing osmosis to be quicker. Obtaining Evidence Results 1 2 3 4 5 6 Concentration (M) ...read more.

Conclusion

Osmosis occurred fastest in the 0.1 Molar sucrose solution, this happened because the solution was quite week allowing it to pass through a semi-permeable membrane in the chip due to the high concentrated solution inside the chip. Evaluation By doing this experiment I was able to show the effect of concentration of sucrose on the speed of osmosis, this is shown in my results. Most of my results are as accurate as I think I could have got them, however there are a couple of results on the mass after where the mass after drops bellow the mass before at a weak concentration. These anomalies where probably caused by an increase in temperature or a slightly stronger solution than with the other results. If I did the experiment again then I would do each concentration more than twice, probably three or four times each, this would give me a much more accurate set of results because I would get a much more accurate average and I would have enough results to ignore any anomalies. ...read more.

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