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# An investigation to determine the effect different concentrations on osmosis in a Potato.

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Introduction

An Investigation to determine the effect different concentrations on osmosis in a Potato For the experiment I will need to get the right shape of the potato and use the same size of that shape to keep the surface area the same and also keep that the same in each of the experiments to keep it a fair test. So I will get a cork borer and make cylindrical shaped potato pieces. Then I cut off the ends of the potato. I will also measure the length of the potato to 3cm I am going to cut the size of the potato first and then I will put the solution in until it covers the potato. I will measure out just enough solution just to cover the potato chip and this should be about 20 ml. I will cut eight potato chips for the experiment and use the same amount of solution. ...read more.

Middle

Something like 30 hours would just not be sensible because there would not be much difference between 15 and 30 hours. Temperature will also need to be just right. I think that as the potato is made up of living cells, the potato chip will function properly at its optimum temperature. If the temperature is too much the partially permeable membrane will be ruptured therefore much more water will diffuse through it. So I think if I use 37C, which is body temperature, then it will be the right temperature to use. But I will also try room temperature just to check. We are not going to change the potato because the partially permeable membrane will be different on each potato. The potato might be old and have a hard skin and therefore water will not diffuse as well, as in a new potato. ...read more.

Conclusion

Big 37�C 11.34 9.35 16% 1020 Sugar (10%) Big 37�C 11.34 7.58 33.2% 20 Sugar (10%) Small 37�C 2.27 2.04 10.1% 40 Sugar (10%) Small 37�C 2.27 1.97 13.2% 1020 Sugar (10%) Small 37�C 2.27 1.94 14.5% 20 Water (0%) Big 25�C 11.34 12.24 7.9% 40 Water (0%) Big 25�C 11.34 12.31 8.6% 1020 Water (0%) Big 25�C 11.34 12.83 13.1% 20 Water (0%) Small 25�C 2.27 2.40 5.73% 40 Water (0%) Small 25�C 2.27 2.45 7.9% 1020 Water (0%) Small 25�C 2.27 2.62 15.4% 20 Water (0%) Big 37�C 11.34 11.81 4.14% 40 Water (0%) Big 37�C 11.34 11.94 5.29% 1020 Water (0%) Big 37�C 11.34 11.98 5.64% 20 Water (0%) Small 37�C 2.27 2.60 14.5% 40 Water (0%) Small 37�C 2.27 2.65 16.7% 1020 Water (0%) Small 37�C 2.27 2.74 20.7% Apparatus * Ruler * 12 Test tubes * 1 Potato * Knife * 10% sugar solution * Ionised Water * Cork Borer * Measuring Cylinder * Timer * Electronic Scales * Tweezers 9/6/03 GCSE Investigation Sc1 Josh Day ...read more.

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