©eScience Labs, LLC 2018 Diffusion and Osmosis EXPERIMENT 1: DIFFUSION THROUGH GELATIN Data Tables Table 1: Diffusion Data Test Tube Distance After 4 Hours (mm) Distance After 24 Hours (mm) A 16 26 B 31 35 C 25 30 Post-Lab Questions 1. Create a graph of your results with time (seconds) on the x-axis and distance of diffusion (mm) on the y-axis. There should be one line for each solution on your graph.
©eScience Labs, LLC 2018 Diffusion and Osmosis 2. Which solution diffused the fastest? a. Acetic acid 3. Does the rate of diffusion correspond with the molecular weight of the solution? Explain your answer. a. Acetic acid will diffuse through gelatin faster than methylene blue, as methylene blue has higher molecular weight than acetic acid. The smaller the molecule, the higher the diffusion rate
©eScience Labs, LLC 2018 Diffusion and Osmosis Experiment 2: Diffusion Concentration Gradients and Membrane Permeability Data Tables Table 2: Indicator Reagent Data Indicator Starch Positive Starch Negative Glucose Positive Glucose Negative Glucose Test Strip n/a n/a green yellow IKI Solution Dark blue Light brown n/a n/a Table 3: Diffusion of Starch and Glucose Over Time Indicator Dialysis Bag After 60 Minutes Beaker Water After 60 Minutes Glucose Test Strip yellow green IKI Dark blue Light yellow Post-Lab Questions 1. State your hypothesis.
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- Fall '19