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Osmosis in potato

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Introduction

Osmosis in potato 25.9.2007 Veronika Brantov� Mr. Rod Anderson Defining problem and selection variables Purpose: The purpose of the experiment is to show how varying the concentration of salt solution affects osmosis in a potato piece. Background: * Osmosis: Diffusion of water molecules across a membrane from high concentration to low concentration. (Biology, Sixth edition - Campbell, Reece) * Hypotonic: higher concentration of solute than in the cytoplasm - water flows out of the cell * Hypertonic: lower concentration of solute than in the cytoplasm - water flows into the cell * Distilled water: pure H2O Table not necessary for this purpose Hypothesis: If I increase the concentration of salt then the amount of water moving in or out the potato will change and increase or decrease its mass. Prediction: According to the hypothesis my prediction is that the potato mass will decrease with increase of salt solution and increase in distilled water. ...read more.

Middle

I make sure with the ruler that all pieces have the same length - 25mm, if not I trim them with a chipper I also have to make sure all pieces weight the same - 5g. I put one piece of potato in each beaker. I leave the potato in each solution for 30 minutes the total, but at 15 minutes I remeasure the length of potato pieces to see if any change has happened and also weight them. I write down the data measured after 15 minutes in each solution and after 30 minutes in the solution. I follow normal safety procedure during this lab. Error reduction - clean the scale before placing the pot - take all potato pieces out at the same time Method of Collection Procedure is proper and goes in order I stated above. Presentation of data: Weight of potato pieces Distilled water Solution of 2g of salt Solution of 4g of salt 0 minute 5g 5g 5g 15 minute 5.15g 4.9g 4.8g 30 minutes 5.29g 4.79g ...read more.

Conclusion

with distilled water. As we can see there were some errors probably caused by different sizes of cells, which we cannot reduced.\ %ERROR - the percentage error will be based on the uncertaintz and actual values obtained Evaluating Weaknesses: I took only two different sets of data, at 15 minutes and at 30 minutes; if I did couple more times I could see the results better. Limitations: The time for this lab and the amount of tools was limited and slowed the process down. Improving Ways of improvement * Calculating the mass change in the potato piece, by measuring both length and width. * Calculating a value - weight * doing it more times so that it is more accurate Related to weakness/limitations To fill in the gaps in my data I could have taken different results, i.e. 1g, 3g, 5g of salt. This way I could have found more accurate results. Also to make my experiment better I could have repeated it more times, and possibly have worked with someone else, as I was working on my own. ?? ?? ?? ?? 1 ...read more.

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