Osmosis and Diffusion Egg Lab

Name ______

Date ______Per ___

Osmosis and Diffusion Egg Lab

Objective:
In this investigation, you will use a fresh hen's egg to determine what happens during osmosis & diffusion across membranes.

Questions: What will happen to an egg without a shell in vinegar (water) for 24 hours?

What will happen to an egg without a shell in corn syrup for 24 hours?

Hypotheses: Form testable hypotheses for boththe vinegar (water) and corn syrup questions above. Remember to have only 1 independent variable for each hypothesis.

If an egg without a shell is left in vinegar (water) for 24 hours then______

______because______

If an egg without a shell is left in corn syrup for 24 hours then ______because ______.

Design an Experiment:

Materials: (per lab group)
1 fresh hen egg in its shell, masking tape & marker, 200 mLdistilled white vinegar, 200mL light corn syrup, food coloring, clear jar, digital scale, tape measure, paper towels

Procedure:

Day 0(Before vinegar on data table)

1. Label the jar with your lab group, period number, & the words "vinegar (water)" written on tape.
2. Find the mass of the egg in grams with the digital scale & record in the data table#1 “Before vinegar (Day 0).”
3. Find the horizontal circumference of your egg in cm. (before vinegar)
4. Determine the texture: rough, smooth, bumpy, slimy, dry, etc. (before vinegar)
5. Determine the color of your egg. (before vinegar)
6. Place 200 mL of vinegar in the jar. Put a couple of drops of food coloring in and mix. Carefully place the raw egg into the jar.
7. Allow the jar to sit for 48 hours or longer until the outer calcium shell is been removed.

Day 1(48 hours later – After vinegar on data table)

1. Pour vinegar into graduated cylinder and write amount of liquid in data table. Rinse after use.
2. Carefully remove the egg to a paper towel & pat it dry.
3. Find and record steps 2 – 5on #2“After Vinegar (Day 1)” in your data table.
4. Find the difference between before and after the vinegar.
5. Copy the data from step 3 onto line #3 “After vinegar (Day 1)”. Line 2 and 3 should be the same!
6. Clean and re-label the jar with your lab group, period number & the words "corn syrup."
7. Place 200 mL of corn syrup in the jar. Carefully place the raw egg into the jar. Do NOT push it down.
8. Clean all of the sticky corn syrup out of the measuring device and off the counter.
9. Allow the egg to sit for 24 hours.

Day 2(another 24 hours later – after corn syrup)

1. Pour corn syrupinto graduated cylinder and write amount of liquid in data table. Rinse very well after use.
2. Carefully remove the egg to a paper towel & pat it dry.
3. Find and record steps 2 – 5on #4“After Syrup (Day 2)” in your data table.
4. Find the difference between soaking in vinegar and corn syrup.
5. Clean up your work area by making sure ALL corn syrup is gone. No sticky residue should be left.

Collect and Analyze Data:

Data Analysis Continued: Using the data above, graph the mass for days 0, 1, and 2 on the left graph. Graph the circumference for days 0, 1, and 2 on the right graph. Be sure to use an even and appropriate scale

Change in Mass vs. Days in Solution Change in Egg Circumference vs. Days in Solution

Days in Solution Days in Solution

Drawing Conclusions:

Were your hypotheses correct? Why or why not?Be sure to include data from your table for both hypotheses. ______

______

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Communicate Results: (at least 5 sentences): Explain what you learned about osmosis and diffusion along with evidence (data) that they occurred, any possible sources of error and ideas for future experiments to extend this one, etc. ______

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If you’d like, you may copy and paste most of the above and type up a formal lab report. You may also use quality handwriting and graphing skills to write directly on this paper to turn in. Either is fine with me but you must use complete sentences, good grammar, and quality penmanship.

LAST STEP!!!

Go back and reread the entire lab to make sure you followed all directions and did your best work. Be sure to ask if you have any questions!