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Osmosis In Potato Chips

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Introduction

OSMOSIS IN POTATO CHIPS Osmosis is the passage of water from a weak solution to a more concentrated solution, through a selectively permeable membrane. This membrane is like a sieve, allowing solvent molecules, which are small, to pass through it, but preventing larger molecules dissolved in the solvent from passing through. If a selectively permeable membrane separates two solutions of different concentrations then solvent molecules pass through the membrane from the side of lesser concentration to the side of greater concentration. This tends to equalize the concentrations on either side of the membrane. A potato consists of about 80 per cent water and 20 per cent solid matter. Starch makes up about 85 per cent of the solid material, and most of the rest is protein. PLAN: The aim of this investigation is to find the isotonic level of sucrose solution (this is where the potato stays the same). I will then go on to investigate the hyper tonic and hypotonic levels of the solution. (Hypotonic meaning the potato gets bigger or increases in weight, and hyper tonic where the potato shrinks). To test this I will first carry out some preliminary work. During the preliminary work I will be trying to find the isotonic level and then, for the main experiment I will investigate the hyper tonic and hypotonic levels. ...read more.

Middle

However the stop clock will not be stopped after 15 minutes, but only after the potato chip has been taken out of the beaker. This is because time never stops. The potato chip will be removed, dried in filter paper to remove any excess sucrose and water. This will ensure fairness of the experiment. The chip will then be weighed again to see if it has reduced in weight. The weight of the potato chip would be the most accurate to measure, and the most reliable of measurements to take, because a ruler is not accurate enough to detect any slight changes in length or diameter. However, an electronic scale can detect smaller changes. The results will be recorded and placed in a table, from which a graph will be produced. To get the most accurate and fair results it should be carried out at least 100 times. As there is not enough time, it will only be conducted twice. Below is a diagram showing how the experiment will be carried out: I predict that, the more the sugar solution, the smaller the potato chip. The more the water, the larger the potato chip. This is because Osmosis is the passage of water from a weak solution to a more Concentrated solution. ...read more.

Conclusion

0.45 30 20 0.6 0.6 0.6 0.6 40 10 0.6 0.5 0.4 0.45 50 0 0.6 0.3 0.4 0.35 As all of the measurements for the fluids were, multiples of 10, no more than 7 different combinations of solution could be made. ANALYSING: After looking at the table above, it can be seen, that as the amount of water in the solution increased, the weight of the potato chip decreased, and as the amount of sugar solution decreased, the weight of the potato chip decreased. This shows that the results undermine my prediction. For my prediction I predicted the as the amount of water increases the weight of the chip will increase too. However the table of results shows that as the amount of water increased, the weight of the potatoes decreased. Below is a graph showing the results from the table above: Looking back at the scientific explanation at the beginning of the plan it can be seen that a potato is made up of 80% water and 20% solid matter. The starch makes up about 85% of the solid material. This would mean that there would be sugar in potato and that it is possible for Osmosis to take place. Looking at the table and graph it can be seen that Osmosis did take place, and that there was a difference in the weight of the potato after each experiment. ...read more.

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