An Egg-cellent Egg-speriment
-Investigating OsmosisBackground: Osmosis is the process in which water moves through a cell. You will use a large cell
(an egg) to investigate osmosis.
Problem: Which direction will water move (into the cell or out of the cell) in various types of
solutions?
Hypothesis: Make your prediction based on the solutions that egg 1 and egg 2 are in. You will
have two hypothesis, one for egg 1 and one for egg 2.
Materials: *2 raw eggs
*2 cups
*measuring tape (or string and ruler) *vinegar
*corn syrup
*salt
*water
*food coloring
*any solution of your choice
Procedure:
Day 1 and 2: Measure the circumference (use centimeters) of two raw eggs. Record. Place each in a cup of vinegar. Let
it sit for two days.
Day 3: Carefully remove and measure circumference. Record. Egg 1 will be your control. Place it into a cup of water.
Egg 2 will be your experimental egg. Place egg 2 into a cup of syrup. Let it sit for one day.
Day 4: Carefully remove and measure the circumference of both eggs. Record. Egg 1 goes back into the water. Place egg
2 into a cup of water with food coloring. Let it sit for one day.
Day 5: Carefully remove and measure the circumference of both eggs. Record. Egg 1 goes back into the water. Place egg
2 into a cup of very salty water. (add salt to warm water and dissolve as much salt as you can) Let it sit for one day.
Day 6: Carefully remove and measure the circumference of both eggs. Record. Egg 1 goes back into the water. Place egg
2 into a cup of your chosen solution. Let sit for one day.
Day 7: Carefully remove and measure the circumference of both eggs. Record. Now you may throw your eggs away.
Results:
Egg One
Liquid
Data Tables
EggTwo
Circumference
(cm)
Qualitative
Observations (What
does it look like?)
Initial
Vinegar
Water
Water
Water
Water
Liquid
Circumference
(cm)
Qualitative
Observations (What
does it look like?)
Initial
Vinegar
Syrup
Food Color
Salt
Water
Your
solution:
Graph: Make a bar or line graph showing your data for each egg.
Conclusion:
1. Why was it necessary to place the eggs in vinegar?
2. What is it necessary to have a control group? (Egg 1.)
3. Why do you think osmosis is important for cells?
4. Which types of solutions did water move into the cell? How did you know?
5. Which types of solutions did water move out of the cell? How did you know?
6. What does the movement of water through a cell tell you about the size of a water molecule?
Due date ________________________________
EGGSPERIMENT LAB REPORT RUBRIC
PROBLEM STATED
HYPOTHESIS
(Independent & dependent variables included)
MATERIALS & PROCEDURE
(All steps clearly stated)
OBSERVATIONS AND DATA TABLE
(Measurement units identified)
GRAPHS AND/OR ILLUSTRATION
(Title, axes labeled, data points plotted)
CONCLUSION
(Answers the problem, explains results, complete sentences used)
NEATNESS
TOTAL GRADE
Points
Possible
5
5
5
10
10
10
5
50
Points
Received