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To find out the concentration of the solution inside a potato cell.

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Introduction

Osmosis Investigation Plan Aim: To find out the concentration of the solution inside a potato cell. Factors: Amount of Solution: We will keep the amount of solution as 100ml in all the tests. If we vary the amount of solution, it may affect the results so keeping the amount of solution the same will keep the test fair. Mass of Potato before experiment: It is important that we weigh the potato before the experiment so that we know how much the weight increases or decreases during the experiment. Time left in the solution: In each test, we will keep the time that each piece of potato is left in the solution the same. It is important because if we vary the time a lot, the results will be affected because some will have longer for the osmosis to take place. ...read more.

Middle

Pilot test findings: We carried out a pilot test using solutions of 1 molar, 1/2 molar, 1/4 molar and 0 molar (pure water). We found that the difference in weight of the potato in the solution of 0 molar went up by 0.1g, and the weight of the potato in the solution of 1/4 molar went down by 0.3g. This shows us that the molarity of the solution inside the potato cell is somewhere in between these two molarities of solution, so we will use solutions between 0 molar and 1/4 molar in the main experiment. Method: Make up 100ml of each of 5 solutions; 0.4 molar, 0.3 molar, 0.2 molar, 0.1 molar and 0 molar. To make 0.4 molar salt solution, mix 40ml of 1 molar salt solution with 60ml of pure water. ...read more.

Conclusion

When the solution we are using is the same as the solution inside the potato cell, the mass will stay the same because the solution does not need to be balanced out so the amount of water moving into the potato cell is the same as the amount of water moving out. The molarity of the solution inside the potato cell will be between 0 molar and 1/4 molar. Conclusion As the concentration of the solution increased, the average percentage difference between the start weight and the end weight decreased. This tells us that where the weight stays the same, this is the molarity of the solution inside the cell. From the graph, we can see that this point is around 0.85 molars. At 0 molars, the weight increases by ?? ?? ?? ?? Annabelle Weatherhead- Phillips 9.3.2002 ...read more.

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