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The effect of sucrose concentration on Osmosis in Potato Chips

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Introduction

Scott Haslam 10R/E Osmosis Sc1 01/07/02 The effect of sucrose concentration on Osmosis in Potato Chips In this experiment I will be aiming to find out what effects different concentrations of sucrose solution have on the osmosis in Potato Chips. Method: 1. Collect apparatus, which include 6 beakers, top pan balance, measuring cylinder, borer and sucrose solution (see list below). 2. Set up the experiment. This will include using the borer to cut out the cylinder shapes and placing them into each beaker which contains different sucrose concentrations. These vary from 1.0Molar 0.8M, 0.6M, 0.4M, 0.2M and then 0.0M (which is water). There will be enough of the solution in the beakers to cover all of the potato. Whatever amount is covered/ used in the first beaker will remain constant throughout to ensure fair testing. 3. After setting up the apparatus, take the mass of each potato and record it, then measure out the correct amount and concentration of each solution in each beaker. Leave the experiment over night (24 hours). 4. After the 24 hours has passed, go back to check the experiment and record any results. This will include writing down the mass at the end. (Make sure the mass at the beginning was taken) 5. Having recorded any results using the % mass change formula: %mass change = Difference in mass X100. Find out the % increase in Mass at the start mass. ...read more.

Middle

This will happen as a result of osmosis, so the water in the potato will osmose into the very concentrated solutions thus loosing mass and on the very dilute solutions the potato will gain mass as the particles go into the potato. The preliminary experiment is not the final experiment. It is purely to find out what strengths of sucrose solutions will be most suitable for the experiment. Having done the preliminary experiment I have decided to use the concentrations of 1.0M down to 0.0M (water) going down in 0.2 each time. 1.0M 0.8M 0.6M 0.4M 0.2M 0.0M. Molarity (M) Attempt 1 Attempt 2 Attempt 3 Average Aver Diff Mass of potato (g) Start End Start End Start End 0.0 0.6 0.6 0.6 0.7 0.6 0.7 0.7 +0.166 0.2 0.6 0.5 0.5 0.8 0.6 0.5 0.6 -0.066 0.4 0.5 0.5 0.5 0.5 0.5 0.4 0.4 -0.133 0.6 0.5 0.3 0.4 0.3 0.5 0.2 0.3 -0.2 0.8 0.6 0.3 0.6 0.2 0.5 0.2 0.2 -0.333 1.0 0.6 0.2 0.5 0.2 0.5 0.2 0.2 -0.266 Now that I have obtained my results I am able to work out the %mass change in the potato, using the formula: % Mass Change = Difference in mass X100 Mass at start % Mass Change: 0.0M +28% 0.2M -11% 0.4M -24% 0.6M -66% 0.8M -58% 1.0M -49% Having now obtained all my results and my graph has been drawn (see overleaf), I am able to comment on what is shown by the evidence. ...read more.

Conclusion

There are ways in which anomalous results can be overcome. This is to repeat the experiment more than once. In this experiment it was attempted 3 times, it would be much more accurate and fairer had it been repeated 10 times for example. That would insure fewer inaccuracies. Although in this experiment there were some anomalous results and unpredicted errors, I think that on general terms you can trust my results. Reasoning for this is because overall I did get roughly what I expected and by going off my graph the line of best fit does fit in with how it should look. I predicted that the potato chips in the concentrated sucrose solutions would lose mass and the potato chips in dilute solutions would gain mass. This did happen as a result of osmosis, thus my results must have been accurate because if not then what I predicted/expected to happen would not have. This experiment opens doors to other related experiments. For example you could investigate osmosis on the same principle of this experiment but by using different solutions and strengths. You could be more accurate in the experiment just carried out and use a lager range of concentration within a certain range. By this I mean instead of using 1.0M 0.0M (going down in 0.2M each time) you could use more concentrations such as 0.9M 0.7M 0.5M 0.3M 0.1M etc. Also another idea would to be to use something different to potato chips. Another type of vegetable would be an idea. ...read more.

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