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Osmosis experiment with parsnip through differing concentration of sucrose.

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Introduction

Faderera Adeniyi Osmosis experiment with parsnip through differing concentration of sucrose Aim: My main aim in this experiment is to find out if osmosis occurs in a parsnip, and how it affects the parsnip in a different concentration of sucrose solution and water Plan: I will first make a prediction using the knowledge I have on osmosis and I will then carry out the investigation to prove whether concentration affects osmosis in a potato. Using my results I will then try to find a pattern and prove my prediction to be correct or incorrect. After I have done that I will try and find ways in which I could improve the experiment and extend the investigation. Apparatus 1. Parsnip 2. 70% of Sucrose solution 3. Distilled water 4. Weighing scales 5. Stop clock 6. Cork borer 7. 50cm3 cylinder 8. 10cm3 cylinder 9. Pipettes 10. Knife 11. Cutting knife 12. Blotting Paper 13. Test tubes 14. Ruler Method: Simple Procedure: An experiment will be carried out involving putting parsnip in different concentration of sucrose and leaving them ...read more.

Middle

� Size cork borer- so that the size of the potato doesn't vary. � Amount of sugar water- so that the potato pieces have no more or less sugar solution to absorb. � Amount of time potatoes are left in sugar solution. - so that I can record accurate results. Safety: Safety is an important aspect in every experiment, even if the experiment seems to be very harmless. This is why I'll be taking this into consideration. I will be using a very sharp knife, which could injure someone if not handled properly. I will also be very careful that the solutions don't get into our bodies internally, because we are not fully aware of the damage it could do to us. I will also wear my lab coats so that I won't split sucrose solution of cloths. Experiment Volume of Standard solution (cm3) Volume of water (cm3) Weight of parsnip (g) Weight of blotting paper (g) Repeats Repeats 1 1 9 1.2 1.2 0.8 0.8 2 2 8 1.2 1.3 0.8 0.8 3 3 7 1.2 1.1 0.9 0.9 4 4 6 1.1 1.2 0.8 0.8 Obtaining Evidence: Experiment Volume of Standard solution (cm3) ...read more.

Conclusion

The range of the concentrations was adequate but I would possibly create more concentrations if I repeated the experiment so that I would have more varied results i.e. 0.10g, 0.15g, 0.20g and so on. This way would have allowed me to me to also find out the isotonic point far more accurately as the one that I estimated is very approximate. The cutting of the parsnip was the most difficult part of the experiment as although I was recording my results by mass, it could well have affected the surface area and so the overall rate of osmosis. If I were to repeat the experiment I would have possibly found a machine to cut the parsnip, as it would ensure that all the parsnips would be the same weight and dimension. As well as the parsnip I could have used a burette. This would ensure that I have an accurate amount of fluid in each. Reference: www.studentcentral.co.uk/coursework/essays ...read more.

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