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In this piece of coursework Ill be discussing how osmosis happens in a plant cell when put into water and a strong concentrated solution.

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Introduction

Investigating Osmosis Introduction In this piece of coursework I'll be discussing how osmosis happens in a plant cell when put into water and a strong concentrated solution. The purpose of the practical is to experience how osmosis works as well as to discover the effects of concentration of solution on osmosis, in addition I'll be trying to figure out whether different solutions decide whether the plant cell becomes flaccid or turgid. Osmosis is when water molecules move from highly concentrated areas to a less concentrated areas through a partially permeable membrane. Picture taken from:http://www.courseworkhelp.co.uk/GCSE/Science/006osmosis Investigating Osmosis Preliminary work The preliminary work is a bit of a practice/ mini practical before we do the actual practical. In the preliminary work we worked as pairs, we cut out, weighed and measured 4 potato chips and parsnip chips, we then put them into a sugar solution which was left out for 48 hours. After the 48 hours we checked the weight and mass of the vegetable. Equipment list * Paper towel * White tile * Electric balance * Strong sugar solution * Four Beakers : Two big ,Two Small * Vegetable knife * 30 cm ruler * Parsnips * Potato * Water Method * We selected a potato and parsnip * Then we cut Two potato chips and Two Parsnip chips * We weighed all ...read more.

Middle

Results Solutions molars Solutions amount (ml) Mass before 1 2 3 Mass after 1 2 3 0 10 ml 1.6 1.6 1.6 1.9 1.6 1.6 Change in Mass Change in Mass Change in Mass +0.3 +- 0 -+0 Average: 1.7 Solutions molars Solutions amount (ml) Mass before 1 2 3 Mass after 1 2 3 0.2 10 ml 1.6 1.6 1.6 1.4 1.2 1.3 Change in Mass Change in Mass Change in Mass -0.2 - 0.4 - 0.3 Average: 1.3 Solutions molars Solutions amount (ml) Mass before 1 2 3 Mass after 1 2 3 0.4 10 ml 1.6 1.6 1.6 1.1 1.4 1.6 Change in Mass Change in Mass Change in Mass -0.5 - 0.2 -+0 Average :1.36 Solutions molars Solutions amount (ml) Mass before 1 2 3 Mass after 1 2 3 0.6 10 ml 1.6 1.6 1.6 1 1 0.9 Change in Mass Change in Mass Change in Mass -0.6 - 0.6 -0.7 Average:0.96 Solutions molars Solutions amount (ml) Mass before 1 2 3 Mass after 1 2 3 0.8 10 ml 1.6 1.6 1.6 1 0.6 0.8 Change in Mass Change in Mass Change in Mass -0.6 - 1 - 0.8 Average :0.8 Solutions molars Solutions amount (ml) Mass before 1 2 3 Mass after 1 2 3 1 10 ml 1.6 1.6 1.6 0.9 0.7 1 Change in ...read more.

Conclusion

The most difficult part of the experiment was cutting the potato although I was concentrating on the mass and length this might have effected the overall rate of osmosis. The use of a burette would have been helpful with this part of the experiment as it would have helped me measure small amounts of sugar solutions easily. The results of my experiment is reliable as the repeats were close to each other. I have identified an outlier in my results when mass was measured at 0.4molars this could have been triggered by the lack of drying when it was taken out of the test tube or it could have been triggered by the size of the potato chip.When I repeated my results I found that most of them were close together either a few higher or lower which makes the results reliable but even though they are reliable there is no knowing weather its was carried out completely accurate. The way the experiment was carried out is reliable as I used the same equipment through-out , I think that my conclusion should be believed as I received reliable and pretty accurate results the reliability of my data is reliable as it shows the results were close had only had one outlier. By Rumbi Richard Page: ...read more.

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