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In this experiment I am going to try and find out how different levels of salt solution will change potato cell's mass.

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Introduction

Biology AT1: Investigating the effects of salt solution on potato cells by Ross Aylard Aim In this experiment I am going to try and find out how different levels of salt solution will change potato cell's mass. Hypothesis My prediction for this experiment is that there will be a larger mass in potato cells which have been in lower concentration salt solution. As the concentration of the salt solution increases the lower the mass there will be. I am basing this hypothesis on a process called osmosis. Osmosis is the diffusion of water molecules from an area of high water concentration to an area of lower water concentration through a partially permeable membrane. In my experiment the less concentrated salt solution will have a higher water concentration. This means that the water will fill the potato cell to become turgid. As the salt concentration increases the potato cell will have a higher water concentration, causing the potato cell to lose water to the salt solution. ...read more.

Middle

An electric scale shall be used for this procedure. The concentration of salt solution shall be measured as accurately as possible by my eye. My test results went quite well. I found that the potato tube immersed in water increased in mass. This was not the case for the others as they decreased. Conclusion From the results and graphs I can see that my hypothesis was half right. I correctly predicted that the potato mass would increase with the distilled water. I also predicted that the mass would get lower as the concentration of salt got higher. However the results kept on going up, down and back up. The osmosis process says that higher water concentration will go to a lower water concentration. However the potato in the lower water concentration in my experiment decreased less that the 25% concentration. I believe that this is because there was so much salt in the solution that it blocked much of the water from passing out of the cell. ...read more.

Conclusion

In fact the level of detail is not able to be seen on my graph. I am not sure whether I had enough observations to draw a valid conclusion as I still am not sure why my results went up and down all the time. I felt I could expand the results into shorter intervals of concentration and make sure the salt does not sink to the bottom. Apart from one result all of the results were different so in a way nearly all of them did not fit well into a pattern. The only results which really looked out of place were the 100% concentration solutions. None of them looked anywhere near like each other. The theories I gave in the conclusion are the best reasons I can give for these results. As I felt that the salt settling to the bottom of the test tube may have caused the experiment to go wrong I would like to change this so that the salt will not settle to the bottom. This is possible by shaking the test tubes (though your wrists would become very tired!). by Ross Aylard la ...read more.

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