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Investigating the effects of submerging potato tissue in different concentrations of salt solution

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Introduction

Investigating the effects of submerging potato tissue in different concentrations of salt solution In my experiment, I am aiming to find what the effects different concentrations of salt solution have on potato tissue and also why different concentrations of salt solution effect potato tissue. Apparatus List * 1 potato * salt solution (0.60M/dm�) * stopwatch * distilled water * 2 test tube racks * 6 test tubes * measuring cylinder * cork borer (size 4) * filter paper * white tiles * cling film * knife * ruler * graduated syringe * scales * china graph pencil Here is how I set up my apparatus: Method * I took 6 test tubes. I filled 3 with 15cm� distilled water and 3 with 15cm� salt solution, (0.60M/dm�). I labelled each with S for the salt solution and A, B and C on each. I wrote D for the distilled water and A, B and C on each. * I cut 6 cylinders of potato using the cork borer. I chopped off each end where the skin was using the knife. I cut each of the 6 cylinders into equal lengths of 7.5cm. * I patted the potato dry to get rid of excess water. I weighed and recorded the mass of each of the cylinders. * I put one cylinder into each of the 6 test tubes and left them in the solutions for 20 minutes. * After 20 minutes, I took the cylinders out and dabbed them dry. ...read more.

Middle

Plan Apparatus My apparatus list will be the same as my preliminary apparatus with the following changes: * 18 test tubes * Cork borer size 3 * 6 test tube racks * salt solution 1M/dm� I will set up my experiment the same as my preliminary experiment. Concentration of salt solution (M/dm�) Volume of 1M/dm� salt solution (cm�) Volume of distilled water (cm�) 1.00 20.00 0.00 0.80 16.00 4.00 0.60 12.00 8.00 0.40 8.00 12.00 0.20 4.00 16.00 0.00 0.00 20.00 Method * I used the table above to make up my solutions making sure I took all my measurements off a flat surface and from the bottom of the meniscus. * At each of the concentrations (see above table) I put 20cm� of the solutions into 3 test tubes. I am using 3 test tubes for each concentration so I can take an average to get more accurate results and this will also allow me to repeat any anomalous results. * I labelled each of the test tubes with the concentration and A, B or C. * I cut 18 cylinders of potato from the same potato (see variables table) using a size 3 cork borer. I cut off the ends to get rid of the potato skin. I then cut each cylinder to 4cm using a knife. * I dabbed off any excess liquid (see variables table). ...read more.

Conclusion

I did not include this result in my averages, change in mass or percentage change as this would give me less accurate results. To improve my experiment I could have repeated the experiment at 0.00M/dm� and use the new set of results. In general, improvements, I could have made are: * Do more repeats at each solution giving me a more accurate average. * Repeat the experiment at 0.10M/dm�, 0.20M/dm�, 0.30M/dm�, 0.40/M/dm� through to 1.00M/dm� rather than just 0.20M/dm�, 0.40M/dm�, etc. * I could have used a water bath to manage the temperature, controlling the rate of diffusion to make a fairer test. * Used a different shape potato piece, e.g. a flat disk rather than a cylinder as this would give a larger surface area giving me more accurate results and a better average. * In general, taken more time to be more accurate in preparation and in taking my results. Although I could have made improvements, I had just the one anomalous result. I think that the main improvement I could have made was to make sure that my cylinders were all the same diameter and length to begin with which would have given me better averages. However from looking at my results I can say that they are reliable as I have taken 3 readings at each concentration of solution and my results table shows that all 3 readings are usually close together. It is very unlikely that all 3 results would be wrong and so I can be fairly sure that I have a set of reliable results. ?? ?? ?? ?? Lauren Hardern ...read more.

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