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# Potato and Osmosis Investigation.

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Introduction

Lewis Janes 11a Potato and Osmosis Investigation General Introduction I am trying to discover how osmosis is carried out and how it is affected by different concentrations of sugar solution. The key factor I plan to investigate is sucrose concentration, I will vary the sucrose concentration and calculate the effects of this factor on osmosis in the potato chips by recording the mass before the chip is placed in the solution, the mass after and the difference between them. I will finally calculate the percentage change and the required averages. In this experiment a potato will be cut to certain lengths (2cm), measured and placed into a sugar solution over a period of 48 hours. They will then be measured again to see if osmosis has occurred. (The potato chips will be covered in 30cc of solution to ensure that every one is completely covered). Apart from the concentration of 0.0mol/litre the solutions have been made up before hand. The different solutions being used are: 0.0M (Molar concentration) 0.2M 0.4M 0.6M 0.8M 1.0M There was some previous work that influenced my planning this was absorption. Absorption is the taking up of one substance by another, such as a liquid by a solid or a gas by a liquid (ammonia by water). ...read more.

Middle

This is because the measurements may vary slightly between scales. Apparatus Potato Six concentrations of sucrose solutions (0.0M, 0.2M, 0.4M 0.6M, 0.8M, 1.0M) Water (for part solution) Electronic Balance Measuring Cylinder Core Borer Beaker Petri Dish x6 Scalpel Coloured Markers Explanation A range of sucrose sugar solutions will be prepared with concentrations 0 molar, 0.2 molar, 0.4 molar, 0.6 molar, 0.8 molar and 1 molar. This will be done by adding varying amounts of distilled water to varying amounts of sucrose solution. Sections of potato will be cut using a scalpel/core borer and will be measured using a ruler. This part of the preparation must be done very accurately as a change in the surface area may allow more or less osmosis to occur. The mass of each chip will be measured as well so that more results can be obtained. Three chips will be placed in each test tube each time so that I can take an average for each tube. I will use 10ml of each concentration of sugar solution and once in the test tubes they each will be labeled. The potato pieces will then be placed in the different test tubes and then left for 48 hours. Then the potato pieces will be removed, the surface solution removed using paper towels and then they will be re-weighed. ...read more.

Conclusion

This might have either taken some water out of the potato or it might have left some excess water on the potato. This part of the experiment is difficult to come up with an accurate and fair method, as other ways would also lead to some slight mistakes. Also the potato itself was not exactly the same size (I may have ran out of time and just lined the potato chips up and cut them in a straight line), although I did try to cut them to 2cm each. I could also extend the experiment to a more exact level by looking at the potato cylinders under a microscope, and then I would be able to see the cells in greater detail and draw some more observational results. I could also have taken more results for each mass i.e. 5 instead of 3. This would have made the average mass more accurate. Finally, I could also investigate into the effects of other factors that effect osmosis in potato chips and again compare my results with these, as well as taking more repeat readings to improve the accuracy of my experiment. However with all this said I think that the experiment was truly successful and I was very pleased with the complete comparison of my results with my initial prediction. ...read more.

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# Related GCSE Life Processes & Cells essays

1. ## Osmosis is defined as 'the movement of water molecules from an area of high ...

The amount of solution I cover each chip in will be 50ml. The type of potatoes we use are going to be kept the same, because different potatoes may absorb at different rates. For this experiment I am going to use the same brand The time the potato chip is

2. ## Osmosis Investigation

Thus, this must be the isotonic solution for the potato, where its potato cell sap is equal in concentration to the surrounding solution. Therefore, since at this point there is no percentage difference in mass of the potato tubors, 0.4825M must be the concentration of the potato cell sap.

1. ## Factors Affecting Osmosis.

PREDICTION FOR MAIN INVESTIGATION (very similar to prediction for pilot experiment) For this investigation I predict that as the concentration of the sucrose solution increases the mass of the potatoes cylinders will decrease. I can predict this because during osmosis water moves down a diffusion gradient from high water potential through a partially permeable membrane to a low water potential.

2. ## Use scientific knowledge and practical skills to determine the effect of a range of ...

And therefore the weight should decrease, at least noticeable for us to notice. The difference between the water concentration in the potato and the 0.8 molar solution of sucrose is big, and the water in the potato should be transferred from the potato, through the permeable membrane, to the solution surrounding the potato.

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