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# Investigating Osmosis In Plant Cells

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Introduction

Investigating Osmosis In Plant Cells Aim: I am going to investigate whether water moves into or out of cells by osmosis, depending on the concentration on the sugar solution that the cells are placed into. I will know if osmosis has occurred when we take the mass of the plant cell, if osmosis has occurred then the mass will have increased or decreased from the original mass. Background: Osmosis is the passage of water molecules from a weaker solution (a high concentration of water) to a stronger solution (a low concentration of water) through a partially permeable membrane. There are a few factors that can affect osmosis, one of them is temperature. Temperature affects osmosis because at higher temperatures, the water particles have more energy and therefore move around a lot more, this increases the rate of osmosis. ...read more.

Middle

Equipment List * 5 test tubes * 5 equal potato chips (1 potato) * A beaker * 5 different sugar/water solutions (0%, 5%, 10%, 15% and 20%) * A balance * 25ml measuring cylinder * Safety goggles * A scalpel Step By Step Instructions * Firstly, get a test tube and some 0% sugar/water solution (tap water), I then measured 20ml of the solution and poured it into the test tube. * Then accurately cut the potato into five equal chips using the scalpel, weigh them using the balance and record each chips individual mass. * Get one of the chips and put it into the test tube with the 0% solution in it. Make sure you don't forget which chip went into the solution. * Put the test tube into the beaker so it is upright and no solution will be spilled. ...read more.

Conclusion

This is because the solution was more concentrated than the chip so more water molecules have passed from the solution into the chip and therefore increasing its mass. When the solution is weaker in concentration, then the mass of the chip will decrease because the water molecules will pass out of the chip into the solution because the chip is more concentrated than the solution. Evaluation I think my experiment was quite reliable in that what I said in my prediction was proved to be correct. I could have improved my results my repeating the experiment and finding the average of my results. To verify that my results are fairly correct, I have included two other sets of results from other members of my class. In relate to this experiment and to prove my results further I could find at which point that the solutions are equal, I could use my graph as a rough guide. This would prove that osmosis occurs until both solutions are equal in concentration. ...read more.

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