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After conducting this experiment I hope to find out how the mass of a potato chip changes when added to different strengths of salt water due to osmosis.

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Kate Parkin 11HB How Osmosis Effects A Potato Chip In Different Strengths Of Salt Water Aim: After conducting this experiment I hope to find out how the mass of a potato chip changes when added to different strengths of salt water due to osmosis. Scientific Background: Osmosis is the movement of water molecules from a high concentration of water to a low concentration of water, across a permeable selective membrane. This occurs naturally in plants. The movement of water into and out of a potato will cause the mass to change. If the concentration of water outside a potato is less than the concentration inside the potato water will move outwards and the potato will shrink, hence the mass of the potato will decrease. Similarly if the concentration inside a potato is less than the concentration outside the potato water will move inwards and the mass of the potato will increase. At some point water will neither enter nor leave the potato. ...read more.


When the potato enters the 4% salt solution it will still decrease only not by as much. At 1% salt solution the amount of water inside and outside the potato chip is equal and therefor it is not possible for osmosis to take place. In the pure water the potato chip has a lower concentration of water molecules than inside the flask, hence osmosis will have the opposite affect and the mass of the potato will increase. Fair Test and Safety To make sure this experiment is a fair trial I will: 1 Make sure the potato chips are identical in mass and size 2.Make sure the physical elements of every piece of potato remain constant before entering the beaker 3.Make sure the temperature of the beaker remains constant As this experiment doesn't use heat or dangerous chemicals the safety procedures can be overlooked, but just in case my team will wear goggles and take care at all times. Apparatus: 1. ...read more.


Conclusion Although the results do not match exactly to the theory of Osmosis the general trend can be seen especially if the average change is looked at. Although the percentage change on each different trial doesn't agree completely with my prediction it is only by a few percent. I believe that with the use of more efficient equipment and if more care was taken my prediction would be proved correct. Evaluation My results give the impression that as the amount of salt in the salt solution increased the change of mass decreased. This is what I predicted. I did encounter one mistake in my obtaining in the first trial of the 4% salt solution. This may be due to a very slight increase in the amount of the salt solute or in the mass of the potato chip, that was not picked up on the scales. Or a rise in temperature around this flask. To keep my graph accurate I left this out of the average. If I were to repeat the experiment I would take more care in measuring the equipment. ...read more.

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