27 Jun Name of Lab: Lab 3 – Diffusion and Osmosis
Question
Name:
Section Number
Name of Lab: Lab 3 – Diffusion and Osmosis
Date Completed:
Directions:
· Fill in the following fields as completely and accurately as possible. Please be sure to practice appropriate grammar, punctuation, and spelling.
· When finished, save your document with a file name that includes your name, section number, and the assignment (i.e. RoyMason_Lab3_Sect 3536.doc). Please only send .doc or .rtf files. Work submitted in any other format will not be graded.
· Attach your Lab 3, in the assignment section of BB, before midnight on the day it is due. Late work will not be accepted.
·
Be sure you are using your own words! Plagiarism in any form will not be tolerated!
If you are unsure what constitutes plagiarism, consult the most recent college catalog or ask the Instructor or Teaching Assistants. Labs that are judged to be plagiarized will receive no credit.
We would like you to time yourself on these labs to see how long it takes you to work through them. Please take notice of the time you start your lab and note it down. When you’re completed write the time lapsed at the top of your answer sheet. In the box provided.
Time:
Fill in the charts and answer the questions that follow:
Initial Volume in Displacement Cups: (should be 200 ml) 3 cups filled with 200ml each, 1 for each % solution you test.
Concentration
Initial Volume of Tube
(should be about 25-50 ml)
Volume of cup After
Change in Volume of cup
25%
50%
100%
1. Which bag (25%, 50%, or 100%) demonstrated the greatest concentration gradient (difference in concentration between two areas) when placed in water?
2. Based on your knowledge of osmosis and diffusion, what did you expect to happen when the bags were placed in water (Develop a hypothesis for this experiment)? Should the water flow in or out? Should the molasses flow in or out?
3. Describe “selectively permeable”. Why is selective permeability such an important property of our cell membranes?
4. Was the dialysis tubing selectively permeable? Was it permeable at all? What evidence do you have to support this?
5. Was dynamic equilibrium reached in any of the molasses demonstrations? Explain your answer.
6. Give some possible sources of error. If you did not get the result you expected, offer some reasons why—was the experiment flawed? What would you do differently next time?
7. What comments can you make about what you learned from this lab? Why are the properties of diffusion and osmosis important to the study of biology?
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