Osmosis Lab Report

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Abstract Diffusion is the movement of particles from an area of high concentration to an area of low concentration. The diffusion of water molecules across a semipermeable membrane is osmosis. A semipermeable membrane only allows water and other small particles through to be diffused by osmosis. A cell membrane is similar to dialysis tubing. In activity A, dialysis tubing was used to model diffusion across the cell. The glucose in the dialysis bag went from clear to blue with a negative test result before and after and the iodine-potassium iodide in the cup went from dark red to copper colored. The results were positive before and after. In activity B, sucrose concentration was used to see the movement of water molecules through a semipermeable membrane. The contents in the dialysis bag were different molar of sucrose. Some of the contents lost mass while others gained. In activity C, pieces of potato were immersed into sucrose solutions and the mass was calculated before and after to investigate water potential. Some of the contents gained mass while others lost mass. Finally, in Plasmolysis, onion cells were investigated under a microscope. Drops of 15% NaCl were added to see a difference between the onion cell on its own and after the NaCl was added. After that, distilled water was added to the onion and it was again observed under the microscope.…show more content…
Obtained a piece of dialysis tubing that was soaked in water. Rolled the tubing between index finger and thumb and then knotted at one end of the tubing. With a small funnel, 25ml of sucrose solution was poured into the dialysis bag. Smoothed out the top of bag and tied off the open end. The bag was dried and then determined mass. Recorded mass in Table 2. The the bag was immersed into the cup fully. Waited 15 minutes. After the time waited, the bags were dried off and then recorded the final and change of mass in Table

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