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Factors affecting osmosis in potatoes cells.

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Introduction

Science sc1 Factors affecting osmosis in potatoes cells What I am going to Investigate In my project I am going to investigate the how salt solution affects osmosis. To make it a "fair test" I am going to change the strength of the salt solution. For each of the test tubes in my investigation I will dilute the salt solution and see how it has an effect on the potato cells. A fair test means that you only change one variable in the investigation. In order to make it a fair test I will only change the strength of the salt solution (NaCl). In this topic I already know that when the potatoes is left in strong NaCl the cell goes turgid with means the cell goes stiff and due to this the potatoes goes stiff because water goes in to the potatoes due to osmosis. If you don't know already what osmosis is then here is a brief definition, Osmosis is the movement of water take place through the cell membrane, which separates the cell contents from the surroundings. Cell membranes allow some substances to pass through and stop other substances from passing: they are partially permeable. ...read more.

Middle

On the other hand the distilled gained water which means that the cell became turgid and gained water because the water was a lower concentration than the sap and which led to the water being taken in. When I do the final practical I will need to do the experiment with five different concentrations, which are; 1. 20cm� 2.0 M/L NaCl 2. 10cm� x 2.0M/L + 10cm� distilled water (0.1M/L) 3. 15cm� x 2.0M/L + 5cm� distilled water (0.5 M/L) 4. 5cm� x 2.0M/L + 15cm� distilled water (1.5M/L) 5. 20cm� distilled water Conclusion I conclude that when the NaCl is the higher concentration on the outside it will always make the object i.e. potato cells the cell will become plasmolysed and very flexible. If the concentration on the outside is a lower concentration than the inside the cell will gain inn weight and absorb water making the cell very turgid and will snap easily. When I do the investigation for the final time I will make the time the potatoes are in the solutions 15 minutes then osmosis has time to perform. The Investigation Apparatus: * Test tubes/Boiling tubes, * Digital balances to 2dps, * NaCl solution 2.0M/L, (for dilutions) ...read more.

Conclusion

potato cells the cell will become plasmolysed and very flexible. If the concentration on the outside is a lower concentration than the inside the cell will gain inn weight and absorb water making the cell very turgid and will snap easily. If I had to do this project again I would change the way in which we got the potato. I would get a potato borer and get it out that why because then the potato is the same thickness and it can be made the same weight easier than the squares of potato that I had done in my investigation. The evidence wasn't that great because the potatoes were different size and width and that had an effect on the overall investigation. I think that if we done this investigation in the summer we might have had different results because in the summer the potato is a lot drier than in the winter and that might have had an effect on the overall readings. Also if we had a stronger solution perhaps the weight of the potatoes might have gone down even more than they did now because of the stronger solution being on the outside it might have drawn more water out. 1 ...read more.

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