annotated-AP%20BIO%20Osmosis%20Lab

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Chemistry

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Dec 6, 2023

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Caleb Gu AP Lab 4: Diffusion, Osmosis, and Water Potential Before you begin this lab, review the relevant information in the content and in your textbook. Also prepare by reading over this lab in the AP Biology Investigative Lab Manual on pages S51-S54. Prelab (IMPORTANT): Watch the following video throughout these labs https://www.youtube.com/watch?v=LeS2-6zHn6M Lab 1: Effects of Osmotic Potential Differences Across a Membrane Materials: 6 ~ 20 cm strips of dialysis tubing 0.0 M sucrose solution – distilled water 0.2 M sucrose solution 0.4 M sucrose solution 0.6 M sucrose solution 0.8 M sucrose solution 1.0 M sucrose solution Distilled water Timer Digital scale 6 clear plastic cups Lab 1 Hypothesis : Think about what your variables are and construct a hypothesis predicting the relationship between them. As the independent variable of the concentration of the sucrose solution increases, the dependent variable of rate of osmosis will also. Procedure: You will conduct the experiment using the virtual lab here (don’t worry about recording this data, you’ll be provided data): https://video.esc4.net/video/assets/Science/Biology/Gateway%20Resources/cell%20homeostasis%20vi rtual%20lab%20-%20activity/index.html Answer the questions after the virtual lab here. 1. Which dialysis tubes had little or no change in mass after a 24-hour period? A and D 2. Why was pure water used as a control group? The control group provides a standard for comparison for the experimental group 3. Why didn’t the mass of dialysis tubes “A” and “D” change over the 24-hour time frame? The concentration both inside and outside the dialysis tube is the same
Data Concentration of sucrose solution inside dialysis bags (outside always dH2O) 0.0 M (water) 0.2 M 0.4 M 0.6 M 0.8 M 1.0 M Class mean 1.80% 7.8% 13.8% 18.9% 23.4% 26.2% Class standard deviation 8.0% 8.9% 9.9% 12.2% 14.6% 7.6% Class sample size (n) 27 27 27 27 27 24 Graph the above data (remember what your variables are and where they go!) and paste your graph below:
Analysis Questions
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