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To investigate the affects of Osmosis and what conditions it best thrives in.

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Introduction

Biology Assessed Practical Aim: To investigate the affects of Osmosis and what conditions it best thrives in. Scientific Knowledge: From my current knowledge on osmosis, I know that it is a special type of diffusion; it separates two solutions by a partially permeable membrane which allows movement of water molecules, but not large molecules, like sugar. OSMOSIS is the diffusion of water across a partially permeable membrane from a dilute solution to a more concentrated one. The diagram below shows how osmosis happens. The diagram below is a representation of the experiment which I performed during a preliminary task I performed , which instead of using cells, I used a artificial substitute, which is identical to that of a cell's. this is called VISKING TUBING. Also, I used a sugar solution to represent the cytoplasm. More water molecules diffuses across the Visking tubing membrane into sugar solution than move in the opposite direction, whereas the sugar molecules cant diffuse easily out of the tubing because they cannot pas though the bag. ...read more.

Middle

If this experiment isn't a fair test, we will be obtaining the wrong results, which could lead us to the wrong conclusions. First of all, and most importantly, we will have to get the measurements and the weights of the solutions and the potatoes as exact, and as accurate as possible. We will try and get the measurements of the potatoes as accurate as possible for every single potato, evenly cutting the potato pieces, and making a record of the length to the nearest millimetre. And we will be using a very sensitive balance so that we can get the best readings possible. But I believe one of the most important step in the fair testing is to make sure that the potato is fully covered by the solution. This is because the potato should fully submerge, by having total contact with the solution. When using the balance, we will make sure that the balance is reading zero with the small foam bowl, before we put the 3 potatoes on it. ...read more.

Conclusion

We will also make sure that the potato is fully covered by the 6 different kinds of solutions. 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 consideration 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. Results: Analysis and Conclusion: Evaluation: ?? ?? ?? ?? 1 Daniel Wayne Smith Physics Assessed Practical ...read more.

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