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ab L RepoRt assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate student s writing of lab reports by providing this information in an editable file which can be sent to an instructor. Exercise 1: Diffusion through an Artificial Membrane obseRvations Color Solution in cup 1 Solution in dialysis tubing Data Table 1: Changes During Dialysis Data Table 2: Benedict s Reagent Results Color of Solution IKI solution in cup 1 Solution in dialysis bag in cup 2 Distilled water Questions A. What is the purpose of this exercise? What is being tested? B. What color change did you observe in the dialysis tubing? What does that change indicate? C. Was there a color change in the water surrounding the tubing? If so, explain. D. What color change did you observe in the water containing the IKI after heating? What does that change indicate? E. What does the Benedict s reagent detect? F. What does the IKI solution detect? G. In what is way a cell membrane similar to the model cell made of dialysis tubing? H. Is the transport mechanism in the model cell passive or active? Why? Exercise 2: Diffusion at different temperatures obseRvations Data Table 3: Diffusion of KMnO4 at Various Temperatures and Times Temperature inside cup Questions A. How does temperature affect the rate of diffusion? B. State a general hypothesis to cover how temperature affects rate of diffusion Exercise 3: Tonicity and Diffusion obseRvations Data Table 4: Potato Dimensions. Distilled water 10% Sodium Chloride Potato Questions A. What is the condition of each potato strip after soaking in the test tubes for an hour? Which one is limp and which one is crisp? B. How would you explain the difference in the conditions of the potato strips using the concept of tonicity? C. What was the tonicity of the fresh water solution with respect to the potato cells? D. What was the tonicity of the salt water solution with respect to the potato cells? E. How do the changes in the conditions of the potato strips relate to the wilting of plants? F. How does keeping vegetables cool slow them from wilting? ... View Full Document

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