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To investigate the mass and surface area of potato chips after being in different concentrations of NaCl.

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Introduction

An Experiment to investigate the mass and surface area of potato chips after being in different concentrations of NaCl. * I predict that the percentage decrease in mass and surface area of the potato chips will decrease more as the percentage of NaCl is increased. -This is because the NaCl solution has a higher concentration and lower water potential than the potato, which has a low concentration and high water potential. Therefore I predict osmosis will occur. I define Osmosis as the movement of any solution's molecules from a place where they are highly concentrated to a region where they are in lower concentration. These molecules must pass through a semi permeable membrane (in this case the cell wall), which lets through smaller molecules but not larger ones. So water molecules from the potato will pass through the cell wall to the NaCl solution. My prediction will only be correct if the skin of the potato is removed, as skin is not semi permeable. I based my prediction on information from "Biology for You"-Gareth Williams, p21+ I predict that a graph of my results will look as following: * I will be controlling the % of concentration of NaCl that the potatoes are placed in. ...read more.

Middle

* I will not be accurately controlling the temperatures in the room when my experiment is being carried out. But in my pilot study I found that it is best to complete all the investigation at the same time, with all windows closed to avoid vagueness in my results and avoid anomalous data. Apparatus Four large potatoes (enough to cut 15 potato chips of the specified dimensions) * 5 glass beakers of capacity 200cm * Sufficient 10 % NaCl solution * Two measuring cylinders of 10ml * A tile (white) * A crayon * 5 Timers * Weighing scales * A ruler measuring 30cm/ 300mm * Distilled water * Tissue * Scalpel Concentrations % concentration beaker Volume of 10% NaCl solution in ml Volume of Distilled water in ml Total volume in ml 2% 40 10 50 4% 30 20 50 6% 20 30 50 8% 10 40 50 10% 0 50 50 Method * Cut fifteen potato chips using a 7mm radius (three repeats for each %concentration - these repeats have to be on a separate potato chip as it would be difficult to return the mass of the chip to its original mass. ...read more.

Conclusion

* Tabulate all results (the mass before for each chip, the average mass & surface area for the three potatoes to be placed in each solution before, the mass, after for each chip, the average mass & surface area after for three potatoes placed in each solution and the percentage increase/decrease in mass and surface area). This will involve the following calculations: Average Mass % increase/decrease Average surface area % increase/decrease original mass x 100 original surface area x 100 mass after surface area after Safety: As my investigation will involve chemicals and glassware, it is vital that all hazardous objects are cleared away from the bench that the investigation will be performed at and that a lab coat must be worn. My investigation must also be carried out in a calm, quiet environment, as lack of concentration would greater the risk of errors in tabulation or the recording of my results. As In all experiments hair must be tied back, safety goggles worn and all apparatus cleaned up immediately afterwards so as not to cause an accident. ?? ?? ?? ?? Charlie Matthews 10C 5/2/2007 1 of 3 ...read more.

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