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Osmosis Through Egg Lab

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					SBI 3C – Grade 11 College Biology


                 Osmosis through the Cell Membrane of an Egg


Background:
Osmosis is the diffusion of water across a selectively permeable membrane. This is the
process by which water moves from the side of the membrane with a high concentration of
water (low concentration of solutes) to the side that has a lower concentration of water. This
continues until the solute concentration on both sides is equal.

Day One Procedure:
1. Find the mass of each egg in grams and record this information in the data table.
2. Carefully place both eggs into a 500 ml beaker.
3. Slowly add white vinegar into the beaker until both eggs are submerged.
4. Cover the jar with saran wrap.
5. Using making tape, label the jar with your names.

Day Two Procedure:
1. Observe what happened to the eggs and record this information in the data table.
2. Gently remove the eggs from the vinegar and carefully rinse each egg with tap water.
   Make sure the water is flowing slowly from the tap.
3. Pat the eggs dry with paper towels and mass them separately. Record this information in
   the data table.
4. Label two 500 ml beakers with the following labels: syrup and distilled water.
5. Place one egg (Egg # 1) in the beaker labeled syrup and slowly add corn syrup into the
   beaker until the egg is fully submerged.
6. Place the other egg (Egg # 2) in the beaker labeled distilled water and slowly add distilled
   water into the beaker until the egg is fully submerged.
7. Cover each jar with saran wrap.
8. Using making tape, label each jar with your names.
9. Pour the vinegar into the sink.

Day Three Procedure:
1. Observe what happened to the eggs and record this information in the data table.
2. Carefully remove each egg from the beakers and gently rinse them with tap water.
3. Pat the eggs dry with paper towels and mass them separately. Record this information in
   the data table.
4. Carefully place the egg from the corn syrup (Egg #1) into the beaker labeled distilled
   water.
5. Carefully place the egg from the distilled water (Egg #2) into the beaker labeled syrup.
6. Cover each jar with saran wrap.

Day Four Procedure:
1. Observe what happened to the eggs and record this information in the data table.
2. Carefully remove each egg from the beakers and gently rinse them with tap water.
3. Pat the eggs dry with paper towels and mass them separately. Record this information in
   the data table.
4. Pour the distilled water and corn syrup into the sink.
5. Discard of both eggs. See the teacher for more details.
Table 1: Mass of both eggs.

                                      Egg # 1           Egg # 2
 Initial Mass (g)

 Mass (g) after vinegar

 Mass (g) after corn syrup

 Mass after (g) distilled water



Table 2: Qualitative observations of both eggs.

                                     Egg # 1                           Egg # 2
 After vinegar




 After corn syrup




 After distilled water




Discussion Questions:
1. What was the purpose of the vinegar?
2. a. Explain what happened to the egg when it was placed in the corn syrup.
   b. What type of solution is the corn syrup?
3. a. Explain what happened to the egg when it was placed in the distilled water.
   b. What type of solution is the distilled water?
4. Explain what happened to the mass of Egg # 1 as it was transferred from the vinegar to
   the corn syrup and then to the distilled water. Why did this occur?
5. Explain what happened to the mass of Egg # 2 as it was transferred from the vinegar to
   the distilled water and then to the corn syrup. Why did this occur?

				
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posted:2/5/2013
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