Osmosis Lab Report

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Introduction Osmosis is the diffusion across a semi-permeable membrane. It works by moving the water molecules to different places with a lower concentration until it reaches equilibrium. Osmosis is moving water molecules from an area with high concentration to an area with low concentration through a partially permeable membrane. without osmosis, our cells would die do to lack of water, but osmosis allows water to enter through diffusion. in this lab, there is an observation of a demonstration of osmosis, prediction of how various factors affect the rate of osmosis, and interpretation of data about osmosis. Osmosis Lab Taylor Harvey 9/9/13 Hypothesis If adding sugar to a solution increases the rate of osmosis, then the higher percentage of sugar added, the faster the osmosis will reach equilibrium. Materials the materials included three strips of dialysis tubing, water, 6 clamps, sucrose solutions, pipet, beakers, timer, marker, and balance. Methods • First, obtain three strips of dialysis tubing and soak it in water for 30 seconds. • Second, you close one end of the tube with a clamp. • Third, you place 10 ml. of solution A,B,C into separate dialysis bags with a pipet. (Solution A- with sucrose, solution B with twice as much sucrose, and solution C containing water.) • Fourth, clamp the other end of tubing, leaving about a 2 cm. pocket of air. • Fifth, label the tubing with a letter of solution in bag. • Sixth, rinse each bag with water then blot dry with a paper towel. • Seventh, measure the mass of each bag and record data. • Eighth, prepare beakers A,B, and C with 200 mc. of water. • Ninth, place bags in the corresponding beakers. • Tenth, allow each bag in each solution to soak for five minutes. Osmosis Lab Taylor Harvey 9/9/13 • Eleventh, at the end of 5 minutes, take all of the bags out of the water at the same time • Twelfth, dry bags

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