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...hich measures accurately to two decimal places. We will work out the mass by subtracting the dishes mass. We will have five test tubes, each with different concentrations of salt solution. They will be: 5%, 10%, 15%, 20% and 0%. The rest of the 20mls will be filled with water. After, we measure them carefully, we will place each batch in a test tube. We will leave them all overnight each for the same amount of time. We will cover the tubes with bungs. After we will drain the fluids out of the test tubes gathered in their cylinders and dry each batch. We will then weigh them in their groups. The idea of drying them all is to get rid of any excess mass to make it a fair test. We will then gathered all these results and we will be able to make a percentage change (in mass). What we will measure and how?! We will measure the amount of water and concentration in each test tube. We will do this by using a measuring cylinder and observing the amount at eye level (meniscus). We will also check we use a size three cork borer for each cylinder so each one is equal in diameter to make it a fair test. We will weigh each batch on a sensitive electric balance, making sure it is set at zero with the dish on. Before that we will measure the lengths of each cylinder with an accurate ruler. We will also measure the mass after osmosis. We will do this by thoroughly, but carefully, drying the solution off the cylinders so the weighing is accurate. We will also make sure to use the same salt solution for each one and to extract from the same potato. Variables that need controlling and how they effect osmosis Weber denied We will make sure that all the potato cylinders are the same. Also we will not change the size of the cork borer. This is because we are changing concentration and not the surface area. So if they were different sizes, it would be unfair as in some of them osmosis could occur faster or slower, due to the differences in size. We will keep the time of how long the test tubes are left for because if they had different amounts of time for osmosis to occur, some of them will have had longer to change than others. Osmosis how/w...