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Osmosis Investigation.

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Osmosis Investigation Aim My aim during this investigation is to vary different amounts of sugar solution and to see how this will affect a potato, with a process of osmosis. I will also record the weight at the start of the experiment, and at the end after the chip has been placed into the solution. General knowledge Osmosis is the movement of liquid from one solution into another, through a membrane that separates them. This process mainly applies to the survival of living things, and is essential. For example, plant absorbs most of its water by the process of osmosis. In animals, osmosis helps continue the flow of water between body cells. The process of osmosis works with a mixture of substances that cannot be separated. This is known as a solution. Inside a liquid solution, is a dissolved substance called a solute and a liquid called solvent. During osmosis some of the solvent moves to another solution through a membrane. This membrane is known as a semi-permeable. It allows some substances to pass through but no others. The solvent would be able to move to different solutions, according to the temperature and pressure of each solution. ...read more.


Even when weighing the chips, the readings need to be accurate and familiar. By doing this we will read the scale to the nearest 2 decimals. I would also need to make sure; nothing disturbs the scale (sensitive balance). By doing this I will make sure, that extra weight or paper is not affecting the scale. I will also make sure, the scale reads zero, before weighing anything Also another factor that may affect the practical is the temperature. We musts make sure the temperature is constant, and doesn't differ. For example doing the first half of the practical sunny, and the second half windy, will result in our practical with false readings. We must also make sure that the making of solutions is done accordingly to the table given. If the solution in one test tube is different than the other this will affect the results resulting in an awkward pattern. Leaving the dish and chips out for 24 hours would be affected if tampered with, so it needs to be kept in a safe place, away from any tampering, which would affect the whole practical. ...read more.


My table shows the weight/g of chips before and after, with the 6 concentrations of sugar solution. I will also include the change in weight/g and the percentage change, which follows the formula of: Change in mass (g) * 100 Mass at start (g) Molar concentration Weight at start/g Weight at end/g Change in weight/g Percentage change 1Molar 1.7 1.48 -0.22 -13% 1Molar 1.8 1.5 -0.3 -16% 1Molar 1.97 1.5 -0.47 -24% 0.8 Molar 2.0 1.67 -0.33 -16.5% 0.8 Molar 1.9 1.58 -0.32 -17% 0.8 Molar 1.9 1.58 -0.32 -17% 0.6 Molar 1.9 1.63 -0.27 -14% 0.6 Molar 1.73 1.58 -0.15 -8% 0.6 Molar 1.6 1.51 -0.09 -6% 0.4 Molar 1.64 1.63 -0.01 -1% 0.4 Molar 1.78 1.68 -0.1 -5% 0.4 Molar 1.83 1.75 -0,08 -4% 0.2 Molar 1.6 1.79 0.19 11% 0.2 Molar 1.8 1.85 0.05 2% 0.2 Molar 1.6 1.71 0.11 6% 0 Molar 1.57 1.89 0.32 20% 0 Molar 2.01 2.25 0.24 12% 0 Molar 1.69 2.02 0.33 19% I also included another table below to show the average percentage change, which would play a part when drawing up my graph. 1M 0.8M 0.6M 0.4M 0.2M 0M -18% -16% -9% -3% 16% 17% Conclusion By looking at my graph which shows the average percentage of change in weight Paul Akinniranye ...read more.

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