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Investigation into Osmosis in Potato Chips

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James Duncan L5Y Investigation into Osmosis in Potato Chips Aim: My main aim in this experiment is to find out if osmosis occurs in a potato, and how it affect the potato in different molar solutions of salt and water. Apparatus: Cutting tile - to cut the potato on Knife - to cut the potato 25cm Measuring cylinder - to measure the solutions Distilled water - part of the experiment Salt solution - part of the experiment Potatoes - part of the experiment Tissue paper - to dry the potatoes after the osmosis takes place Balance - to weigh the potatoes Test tube - to hold the potato and solution 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 predictions. And figure out a way to make this investigation fair and safe. Planning ahead would help me find out how to do what, when, which should help me achieve 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.' ...read more.


If this experiment isn't a fair test, it will give the wrong results, which could lead me to the wrong conclusions. First of all, and most importantly, I will have to get the measurements and the weights of the solutions and the potatoes as exact. I will try and get the measurements of the potatoes as accurate as possible for every single potato, evenly cutting the potato pieces, and making a record of the length to the nearest millimetre. I will also be using a very sensitive balance so that I can get the best readings possible. When using the balance, I will make sure that the balance is reading zero before I put the 5 potatoes on it. After the experiment, I will measure the 5 potatoes and take a reading to the nearest 2 decimal places. I will also be reading the measurements of the measuring cylinder by reading the bottom of the meniscus. Carrying out the experiment in a constant temperature is important. To avoid temperature change, which might affect the results, I will take the temperature of the solution into account. I will keep the experiment at room temperature at all times. ...read more.


This tells me that my experiment was successful. The graphs and the results show that: Osmosis actually took place in the experiment. As the molars increased, the percentage of the weight difference decreased. Evaluation: I followed the plan correctly and I believe I gained accurate and sufficient enough results to conclude the experiment, and to prove my hypothesis. My final results were very reliable, due to the precautions I took to make this a fair test. To make this experiment better, I believe that timing of the experiment could have been more accurate. I could have done one test at a time, so that I could reduce the time difference. Repeating the experiment would have given a more accurate average, but I believe that it is not necessary as the results were accurate. Using more types of molar sucrose solutions would have helped me obtain better and a wider range of results, and more accurate results. Also, experimenting with one set for a longer period of time, for each set, would give me better results, because the osmosis action would reach its maximum, and therefore tell us how much water could be transferred for each solution. Overall I think this experiment turned out to be very successful, and I'm very pleased with my results. ?? ?? ?? ?? ...read more.

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