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# Does Concentration Affect Osmosis?

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Introduction

Does Concentration Affect Osmosis? Apparatus: * 15 x potato chips (1cm x 1cm x 1cm) * 5 x 250ml beakers * 5 different concentrations of sucrose solution - 0% - 5% - 10% - 15% - 20% * 1 x scalpel * 1 x tile Method: 1. Using scalpel, cut potato into 15 1cm x 1cm x 1cm chips 2. Put 50ml of the 0% sucrose solution into the first beaker. Repeat using remaining concentrations and beakers 3. Make 5 dividers from acetate and place one in each beaker 4. Weigh each potato chip and record mass, mark each with a different coloured permanent marker. 5. Place three potato chips in each beaker, each in a different compartment 6. Leave for 24 hours 7. Take out each chip, dry and weigh new mass. Record new mass. Fair Test: To make the experiment fair, I will: * Make the potato chips the same size each time * Store all the beakers at the same temperature * Use the same amount of Sucrose Solution every time * Leave all the chips for the same amount ...read more.

Middle

0.54 8% 1.19g 0.44g - 0.75 Potato C 15% 1.3g 0.67g - 0.63 15% 15% 0.8g 1.1g 0.7g 0.15g - 0.1 - 0.95 These results are not accurate, as, due to circumstances beyond my control, I had to leave them for too long. Also, I did not have time to complete all the concentrations in my plan, therefore I am going to use results given to me. Results Concentration Mass Before Mass After Difference in Mass Average Difference in Mass 0% 1.36g 1.51g + 0.15g 1.29g 1.39g + 0.10g + 0.13 1.09g 1.24g + 0.15g 2% 1.26g 1.37g + 0.11g 1.41g 1.52g + 0.11g + 0.11g 1.42g 1.53g +0.11g 5% 1.19g 1.03g - 0.16g 1.50g 1.13g + 0.03g - 0.63 1.16g 1.10g - 0.06g 10% 0.85g 0.86g +0.01g 0.87g 0.87g 0g - 0.57 0.84g 0.66g - 0.18g 15% 1.43g 1.25g - 0.18g 0.76g 1.23g 0.64g 1.06g - 0.12g - 0.17g - 0.47 Graph I have drawn a line graph to show my results. I have drawn a line of best fit and included error bars. ...read more.

Conclusion

I had originally intended to leave the experiment for 24 hours, but, due to unforeseen circumstances, this time was doubled, making my results very inaccurate. I think that, because I left the potato chips for so long, the cells may have dies, thus making the potato chip lose mass. I did not manage to overcome these problems and had to use a set of results given to me for my analysis. There are a number of other experiments that I could have done, but my preliminary work showed that this was the best one. The experiments that I tried, and the reasons that they didn't work as well as this one are listed below: * using raisins instead of potato chips - this doesn't give enough change in mass because the raisins are too small * visking tubing - this is too hard to measure and is unreliable So, in conclusion, although my experiment went wrong, I have found out that in very low concentrations of sucrose, the effects of osmosis are very little and the cells gain mass slightly, whereas in higher concentrations, the effects are greater and the cells lose mass. ...read more.

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