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Osmosis Investigation Essay

3092 words - 12 pages

Aim: To find out how osmosis occurs and differentiates using various concentrations of water.Variables:The variables which we could investigate are:*Size of the potato chip. This will change the surface area and volume of the potato chip as the higher the volume, the higher the capacity*The concentration of the solution. The higher the solution is concentrated in water the more water particles there will be in the solution*Different potatoes. This will affect the actual potato chip as the amount of water in the potato would be different in each potato as they were harvested in different areas and different ways.*The temperature and sunshine. This is an important factor because if there were different amounts of sunshine and the temperature was affected, the water particles will be either more energized or less energized.Preliminary ExperimentThe preliminary experiment was carried out because it would give us valuable information on the different concentrated solutions to use. It will also give a before hand experience of the experiment so that if any changes were need to made, they could be followed through. Doing the preliminary also helps in making predictions as it gives an idea of what should happen in the real experiment. It should also give an idea of what concentrations should be needed and what will be ideal to measure (the variable such as volume, mass, dimensions).The results I obtained from the preliminary test are as follows;Concentration(m)Chip 1 (g)Chip 2 (g)Chip 3 (g)AverageDistilled 1.501.801.701.671.001.401.301.201.302.000.800.900.700.80Concentration(m)Previous Mass (g)Difference in mass (g)Distilled 1.06+0.611.001.06+0.242.01.06-0.26After carrying out my preliminary test, I have come to the conclusion that I will use more potato chips so that my average is even more accurate, and also use more concentrations of water for the same reason.Prediction: I predict that as I place the potato chip in a high concentration of sodium chloride, the potato chip will become flaccid and vice versa with a low concentration.Hypothesis: The definition of osmosis is: The movement of water molecules from a region of high water concentration to a region of low water concentration through a partially permeable membrane.A potato chip has been used to act as a partially permeable membrane. The tiny holes in the cell membrane of the potatoes will only allow small molecules like water to diffuse in and out of the solution. We will be using a salt mixed into water; this is called a solution as there are more than two particles. When a substance dissolves in water, in this case salt, the salt molecules attract some of the water particles and stop them from moving freely. This then reduces the concentration of water molecules. So therefore when there is more sugar molecules in the solution there are less water molecules that are able to move freely. Below is a picture of what a solution of water and salt would look like in molecular form which would be...

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