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Biology Experiment On Osmosis For Gcse Very Good Got An A* As Course Work So Do Not Miss Out

3762 words - 15 pages

The effects of osmosis on potatoes placed in different salt concentrationIntroduction:Osmosis is a movement of water across a semi-permeable membrane. This may only happen when there is a difference in concentration between the two sides of the membrane. The water moves from low concentrations to high concentrations. That is because the low concentrated area tries to dilute the opposite via osmosis.The effects osmosis has on a cell are either that it becomes turgid and hard as water enters the cell or it becomes dehydrated (this is called plasmolysing in plant cells) as water leaves the cell and the solution enters. There is a change of mass, volume, texture and length.Aim:The aim is to investigate the effects of varying concentrations of a salt solution on the amount of osmotic activity between the solution and a potato of a given size.Osmosis:Process of OsmosisOsmosis is the process of the flow of one constituent of a solution (in this case salt) through a membrane while the other constituents are blocked and unable to pass through the membrane. Experimentation is necessary to determine which membranes permit selective flow, or osmosis, because not all membranes act in this way. Many membranes allow all or none of the constituents of a solution to pass through; only a few allow a selective flow. That is why I have chosen potatoes as my semi-permeable membrane.In osmosis, a solvent (often water) moves from a region of low concentration to a region of high concentration through a semi-permeable membrane. Here, water molecules diffuse into the concentrated salt solution because the water molecules are small enough to move through the semi permeable membrane. The larger salt molecules are unable to move through the membrane into the water solution because the membrane acts as a net. Osmosis will stop when the two solutions reach equal concentrations on either side of the membrane.Hypothesis:The hypothesis is that as the solvent, the water enters the potato cell to dilute the concentrated salt solution in side the cells. As the salt solution gets weaker more water will enter the cell. This is because more water is needed to dilute the stronger salt solution concentration in the potato cells. The water will try to flow in and out of the potato continuously until it will reach an isotonic equilibrium. The potato cells become turgid and hydrated. However the potato is a plant therefore it has a cell wall that means that at some point the cell wall will stop letting in water or slow it?s flow down. If the plant cells did not have a rigid cell wall they would burst, like in animal cells which have soft cell walls.In this particular investigation I intend to prove that the lower the concentration of the salt solution in the petri dish, the greater the mass of the potato will be. This is because the water molecules pass from a high concentration, i.e. in the water itself, to a low concentration, i.e. in the potato chip. Therefore, the 4 cm core bored...

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