Objectives:
* To demonstrate the semi-permeability of a cell membrane* To lay ground-work for discussion of
osteoporosis
Materials Needed: 1 raw egg in its shell clear vinegar 3 wide-mouth jars or plastic cups corn syrup water Procedure: 1. Measure and record the circumference around the center of the egg.
2. Record the appearance of the egg. Weigh the egg if possible.
3. Place the egg inside the jar. DO NOT crack the shell.
4. Cover the egg with vinegar.
5. Observe immediately, and then periodically for the next 72 hours.
6. Remove the egg after 72 hours and measure its circumference. Weigh the egg if possible.
7. Compare the appearance of the egg before and after being in the vinegar.
8. Put corn syrup in a clean jar and then place the egg in the jar and let it sit over night.
9. Compare the appearance of the egg before and after the syrup. Weigh the egg if possible.
10. Put fresh water (tap or distilled works) in a clean jar and place the egg in the jar and let it sit over
night. 11. Compare the appearance of the egg before and after the syrup. Weigh the egg if possible.
Strategy: The egg has a hard shell on the outside and the circumference
will vary. Bubbles start forming on the surface of the egg's shell
immediately and increase in number with time. After 72 hours,
the shell will be gone and portions of it may be seen floating on
the surface of the vinegar. The egg remains intact because of the
thin see-through membrane. The size of the egg has increased.
The shell of the egg is made of calcium carbonate, commonly
called limestone. When vinegar chemically reacts with the
limestone, one of the products is carbon dioxide gas, those
bubbles seen on the egg. The membrane around the egg does not
dissolve in vinegar, but becomes more rubbery. The increased
size is due to osmosis, the movement of water through a cell
membrane. The water in the vinegar moves through the thin
membrane into the egg because the water inside the egg has
more materials dissolved in it than does the vinegar. Water will
always move through a membrane in the direction where there
are more dissolved materials. The contents of the egg stayed
inside the membrane because the molecules were too large to
pass through the tiny homes. This selectiveness of materials
moving through the membrane is called semi-permeability.
Assignment Question:
Explain your observations in detail in terms of concentration
gradient, diffusion, osmosis, osmotic pressure, passive transport,
and active transport. Submit your document along with PHOTO
DOCUMENTATION for EVERY STEP using the link provided.
1.

• 1499066046-Osmosis Lab 3.docx

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