Week 3 Lab Exercise
Name: Section: Carefully read activity #2 on pg.47. After performing the lab experiment at home, carefully answer the
following questions. 1. a. Ice water: How long did it take for the water in the entire container to change from clear to
colored?
b. Boiling water: how long did it take for the water in the entire container to change from clear
to colored? 2. Write a conclusion based on your hypothesis and the results of your experiment. 3. Which water temperature (room temperature, boiling water, or iced water) could represent the
control in your diffusion experiments? Explain your answer. 4. In addition to temperature, what other factors might affect the rate of diffusion? 1 Week 3 Lab Exercise
Name: Section: Read activity #3 on pg.49. Perform the lab experiment at home and carefully answer the following
questions. 1. Measure the circumference of the tubing by wrapping a piece of string around the largest
section of the tube (see figure 5-3 pg.51).
a. Record length:
cm 2. Place the dialysis tube into the clear container of salt water. Let it sit in the water for four hours
and record the circumference of the tubing as explained in question 1.
a. Record length:
cm 3. Did the circumference increase or decrease? Explain your answer. 4. Based on your understanding of osmosis, why is it important for intravenous fluids given in a
hospital to have the same osmotic concentration as your own cells and body fluids? 2

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