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# Investigation:Osmosis In Plants

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Introduction

Investigation: Osmosis In Plants I am going to find out if the concentration of a solution affects osmosis in potato cells. I will use a slice of potato to do this. I will measure the mass of the potato and then put it in a solution of salt water for 15 minutes. I will then measure the mass of the potato again and record the difference. I will repeat this with different concentrations of salt-water solution to see what effect it has. Prediction I think that when the concentration is lower the weight of the potato will increase but when the concentration gets higher the weight of the potato will decrease, as the water is lost through osmosis. I think that this will happen because of the principal of osmosis. This means that water will pass through a semi-permeable membrane from an area with a high concentration of water to an area with a lower concentration. I have studied osmosis in class and I have conducted previous investigations on it. From this I know that one of the main areas that osmosis takes place is in cells. ...read more.

Middle

* I will take off any excess liquid with a paper towel. * Then I will weigh the potato and record the change from what it weighed before. * I will then repeat this for each of the concentrations. We repeated this process twice so that our results would be reliable. Apparatus * Scalpel, for cutting the potato into chunks. * Syringe, for measuring the 10ml of salt solution. * Test tube, to conduct the experiment in. * Tweezers, for getting the potato chunks out of the test tube after the experiment. * Stop clock, to time the 15 minutes that the chunks would be left in for. * Weighing scales, to weigh the chunks of potato. Fair Test I made sure that it was a fair test by making sure that the only variable that I changed was the concentration of the salt solution, which was what I was investigating. I made sure that the size of potato was approximately 1g, and I made sure that I always used the same volume of salt solution, which was 10ml. ...read more.

Conclusion

As I was measuring the change in weight it was not essential to make the pieces of potato exactly the same size, so I cut it into similar sized chunks and weighed them to make sure they were roughly the same. I used a stop clock to measure the amount of time I left the potato in the salt solution for, I think that this was accurate enough as we were leaving them in the solution for a long period of time so a small variation would make little differences. I repeated the results twice to make sure they were accurate. Most of my repeated results we're close to each other, although the results at concentration 0.2 show quite a large gap between my to tries. I think this may have been caused by an error when reading the stop clock. If I was to do the experiment again, I would change several things. Firstly I would want to take three sets of results to make sure they were more reliable. I would also want to leave the pieces of potato in the solution for longer so any changes would be greater and the results more conclusive. ...read more.

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