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# To create an isotonic solution that potatoes can be stored in.

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Introduction

To create an isotonic solution that potatoes can be stored in Aim: I will create a solution that will be perfect for storing potato chips in. This solution must have a perfect concentration of salt to water, so creating an isotonic solution, which will stop osmosis occurring so neither causing the potatoes cells to swell up or shrivel up. Variables: To make sure my results are valid I must take into account the variables that may affect my experiment like; * Temperature- changes in temperature can speed up or slow down reaction times. * Size/mass of potato chips- the size and mass of a potato chip can affect the experiment as the larger the potato chip is more osmosis can occur. Simple plan: I will use four different solutions each with a different concentration of salt to water. I will put each solution into a separate beaker then I will place a potato chip in each of these solutions. ...read more.

Middle

Equipment: * Potato - for potato chips (x4) * Scalpel - to cut potato chips to same length and mass * Beakers (x4) - to hold solutions while experiment is underway * Cork borer and plunger - to extract potato chips from original potato * Salt - to be mixed with water to create the solutions to be tested * Tweezers - to place potato chips into the solutions and extract them afterwards * Electronic scales - to get an accurate measurement of the potato chips mass prior to and after the experiment * Stopwatch - to record the length of time the potato chips are in the solutions so to be able to keep this time constant through out the experiment * Ruler - so to be able to measure the lengths of the potato chips so to keep these similar. Safety: * Take care when handling sharp objects e.g. scalpel, glass etc. ...read more.

Conclusion

So I think that a solution with a concentration of water to salt somewhere in between these two extremes will neither cause a cell to shrivel up nor swell up so keeping the cell normal and creating an isotonic solution. Test 1: Percentage of salt in the solution (%) Mass of chip prior to experiment (g) Mass of chip after experiment (g) 0% 0.82 0.65 5% 0.82 0.88 10% 0.82 0.69 15% 0.82 0.63 Test 2: Percentage of salt in the solution (%) Mass of chip prior to experiment (g) Mass of chip after experiment (g) 0% 0.82 0.69 5% 0.82 0.87 10% 0.82 0.68 15% 0.82 0.70 Percentage of salt in the solution (%) Mass of chip prior to experiment (g) Mass of chip after experiment (g) 0% 0.82 0.69 5% 0.82 0.87 10% 0.82 0.69 15% 0.82 0.67 Test 3: Analysis: My results show that generally the most mass is lost when a high percentage of salt is added to the solution (15% salt) and the most mass is gained when a small amount of salt is added to the solution (around 5% salt). ...read more.

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