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Investigating the effect of salt concentration on osmosis in potato tissue.

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Introduction

Investigating the effect of salt concentration on osmosis in potato tissue Aim To measure the change of mass that is incurred on the potato in different salt concentration. Apparatus Stop Clock - to time our experiment Cutting tile - to cut the potato on Knife - to cut the potato 25cm Measuring cylinder - to measure the solutions Potatoes - part of the experiment Balance - to weigh the potatoes Cork borer - to cut out potato cylinders Planning Before actually planning the experiment, I will do some research to find out about osmosis, and matters related to it, so that I can make my predictions. And figure out a way to make this investigation fair and safe. Planning ahead would help me find out how to do the experiment, which should give me good results at the end of the experiment. Hypothesis Osmosis is the passage of water molecules from a weaker solution into a stronger solution, through a partially permeable membrane. In this case, the tiny holes in the membrane of the potatoes will allow the water molecules to pass through in and out of the solution and the potato, depending on the concentration of the two substances. ...read more.

Middle

This is so that we don't get a false reading, with the weight of our potato with the reading it had before. And after the experiment, we will measure the potatoes that should be dried as possible, and weigh it the same way, taking the reading to the nearest 2 decimal places. Method There won't be any control for this experiment, because the weight would vary depending on the potato pieces. And therefore, it might affect the results, which we are going to take in after the experiment. First I will have to get the pieces of potatoes ready. I will push the cork borer through the potato, cutting it into long cylinders with a diameter of 6mm. And then I will cut the potatoes into cylinders of 40mm. I will have 6 sets because we will have to test the potatoes in 6 different types of solutions; 0.2, 0.4, 0.6, 0.8, 1.0 molar solutions of salt and distilled water. I will weigh each set and have them ready for us to put into the test tube. Then we will put the 6 sets potatoes in the 6 test tubes at the same time and start the clock running for 10 minutes. ...read more.

Conclusion

I gained a good set of results and altogether I am pleased with the investigation. The graph obtained from the results has a strong resemblance to the one in the prediction. This suggests that the experiment was fairly accurate. Although 3 repetitions of each concentration are sufficient, there was a possible anomalous result (circled on graph). This part of the investigation would need to be repeated. A possible factor affecting my results is that although the cylinders were taken from the same potato there is no guaranteeing that the density remains the same throughout the potato. Another factor is that the potato from which the cylinders are taken could be abnormal - this could be prevented by amalgamating sets of results, for example of a whole class, where each experimenter used a different potato. I think that three sets of results was a good number. However, I think that in order to improve my results, the last concentration (1 molar) needs to be retaken, as it is an anomalous result. Further work could be carried out to include concentrations that increased in 0.1 M rather than 0.2M. This would increase the accuracy and improve the graph. Other investigations could include using different varieties of potato or different plant tissues e.g. carrot. Tausif Saudi ...read more.

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