Investigating Osmosis

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Investigating Osmosis Aim --- What is the effect of changing the concentration of Sodium Chloride Solution on potato cells? Prediction ---------- I predict that the lower the concentration of Sodium Chloride solution, the higher the final mass and length will be and the higher the concentration of Sodium Chloride solution, the lower the final mass and length. [IMAGE][IMAGE]I also think that with a concentration of 0 and 1 molar, the change in mass and length will be greater than 0.125, 0.25 and 0.5 molar which I think will roughly stay the same. Osmosis is just a special case of diffusion. It is the net movement of water molecules across a semi-permeable membrane from a region of high water concentration to a region of low water concentration. In the diagram the water molecules diffuse into the concentrated sugar solution because the water molecules are small enough to pass through the membrane. The larger the sugar molecules are they are unable to pass through the membrane into the water solution. Osmosis will stop when the two solutions reach equal concentrations on either side of the membrane. Equipment --------- 10 Test tubes Large Potato 4mm Cork borer Scalpel Weighing scales 15mm Ruler Sodium Chloride Solution Measuring cylinder Sticky labels Test tube rack Paper towels Safety ------ To ensure that my experiment is safe I will be sure to wear safely glasses at all times. Take care when using sharp implements like the scalpel and be sure not to spill the Sodium Chloride solution. Fair test --------- To ensure that my experiment is a fair test I will follow my method exactly at all times and be sure to use the same mm cork borer and cut all the potato chips to same length. Method ------ First of all I will collect all of the equipment needed for the

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