Summarize below the results of activity three investigating diffusion and osmosis through nonliving membranes
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Activity 6: Observing Diffusion and Osmosis through Nonliving Membranes Complete the following table to record the results of your Wet Lab with Data from Experiments in Diffusion through a Semi-Permeable Membrane. Table 1. Measurements and observations from dialysis simulation experiment. Tube Weight Change (final weight – initial weight) lodine Test Result (+ or –) AgNO3 Test Result (+ or –) Benedict's Test Result (color) Beaker 3g - 4g (-) + (-) Beaker
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Diffusion and the Cell Membrane Experiment 1: Osmosis across a semi-permeable membrane (con't) Results 1. Record the mass of each cell at each time interval in Table 1. 2. Graph the mass of cells at each time interval in Fig. 4. Using a ruler, draw line plots for cells A-C using the key. Place numbers on the y-axis that represent the scale of the masses your measured. Table 1. Results from Experiment 1 Key: Cell A, Cell B, Cell C Mass change of cells in Exercise D.
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Activity 3 Investigating Diffusion and Osmosis Through Nonliving Membranes The following experiment provides information on the movement of water and solutes through selectively permeable membranes called dialysis sacs. Dialysis sacs have pores of a particular size. The selectivity of living membranes depends on more than just pore size, but using the dialysis sacs will allow you to examine selectivity due to this factor. 1. Read through the experiments in this activity, and develop a hypothesis for each part. 2. Obtain four dialysis sacs, a small funnel, a 25-ml graduated cylinder, a wax marking pencil, fine twine or dialysis tubing clamps, and four beakers (250 ml). Number the beakers 1 to 4 with the wax marking pencil, and half fill all of them with distilled water except beaker 2, to which you should add 125 ml of the 40% glucose solution. 3. Prepare the dialysis sacs one at a time. Using the funnel, half fill each with 20 ml of the specified liquid (see Activity 3 chart). Press out the air, fold over the open end of the sac, and tie it securely with fine twine or clamp it. Before proceeding to the next sac, rinse it under the tap, and quickly and carefully blot the sac dry by rolling it on a paper towel. Weigh it with a laboratory balance. Record the weight in the Activity 3 chart, and then drop the sac into the corresponding beaker. Be sure the sac is completely covered by the beaker solution, adding more solution if necessary. Figure 5.3 illustrates the configuration of the breakers with the contents of the dialysis sacs and the beaker solutions. Beaker 1 Distilled water 40% glucose Beaker 2 40% glucose 40% glucose Beaker 3 Distilled water 10% NaCl Beaker 4 Distilled water 40% sucrose Figure 5.3 Setup for observing diffusion through nonliving membranes.
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