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Investigating osmosis in potato chips

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Introduction

Investigating osmosis in potato chips Planning Introduction: the definition of osmosis is the movement of water particles from a weaker solution to a stronger solution through a partially permeable membrane. Aim of investigation: I am trying to find out how external concentration of liquid surrounding a potato chip affects it - does it increase or decrease in mass etc. Method, diagram and equipment: Diagram of experiment Equipment * 5 Boiling tubes * weighing scales * sucrose solution * cork borer * a knife * white slate * potato Method: for my experiment I will: 1. place 3cm depth of distilled water into a boiling tube and label A 2. place 3cm depth of weak sucrose solution (0.25 Molar) into a boiling tube and label B 3. place 3cm depth of medium sucrose solution (0.5 Molar) into a boiling tube and label C 4. place 3cm depth of stronger sucrose solution (0.75 molar) into a boiling tube an label D 5. place 3cm depth of strong sucrose solution (1 Molar) into a boiling tube and label E Here is a table of how to make the sucrose solution: concentration sucrose Water 0M 0ml 10ml 0.25M 2.5ml 7.5ml 0.5M 5ml 5ml 0.75M 7.5ml 2.5ml 1M 10ml 0ml Then I will: 1. Cut 5 potato chips; accurately measure the length (mm) and mass (g) and record these results 2. place one chip into each tube and leave for 20mins 3. Accurately measure length and mass of the chips again after being in solution and record results. ...read more.

Middle

Therefore the potato chip looses its mass and the length decreases. On the other hand the potato chip in the most dilute solution will become longer and the mass will increase. This is because the weak sucrose solution (the weaker solution) passes into the cells of the potato chip through the partially permeable membrane of the cell wall and into the potato chip making all the cells become turgid an increase the volume of the chip. Preliminary work: During the preliminary experiment some problems arose that I didn't think of before. Such as: leaving bits of skin on the potato chips, cutting the chips into unsuitable shapes so making it harder to get the chips to a similar mass and length, getting the chips mixed up and drying them in different ways. All of these things mean that I didn't make it a fair test so my results were not accurate enough. For the real experiment I took much more care and followed the instructions more accurately. The preliminary experiment helped me decide how many potato chips to test on to achieve the right amount of results to analyse. Also what concentration to put the sucrose solution at to be able to see exactly how it affects the chip and. Obtaining evidence - the results Safety I made this experiment safe by taking precautions to minimise the hazards. When using the knife to cut my potato chips I ensured I paid a lot of attention and didn't get distracted so that I wouldn't cut my fingers. ...read more.

Conclusion

These graphs show similar results to my graph for experiment 1, this suggests that all three of my experiments were relatively equal. However the last point on graph 3 goes down from the previous point I think I must of made a mistake in my calculations or I may of taken the potato chip out at a slightly different time to the other two or possibly I dried it differently. These graphs didn't turn out how I expected, but they still show the point that the solution is equal to the potato (the point at which the line crosses the axis). Graph two and three are very similar but graph 1 is a bit different, I think this may be to do with the fact that my piece of potato for the 1 molar solution is slightly larger than the others. Results compared to predictions My results in general do follow my predictions, my original predictions were: that the potato chip in the boiling tube with the most concentrated sucrose solution will drop in mass and length after the 20 minutes is up because of Osmosis, and the potato chip in the most dilute solution will become longer and the mass will increase. This was proved true by my experiments. However I expected my graph to look slightly different to what it did. Evaluation I think that the quality of my results were relatively consistent and good. I took care to write my results down accurately and ensured all of my experiments were fair and unbiased. ...read more.

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