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Naked Egg Experiment

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Traci Morrison

on 12 May 2015

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Transcript of Naked Egg Experiment

Controlled Variables

is the cups,a towel to wipe the eggs off, vinegar, counter top, the room temperature where the cups will be sitting for a week, and measuring tape.
Constant Variables

is the egg, counter top, cups, vinegar,and room temperature.
The vinegar is the
Independent Variable
Making the eggs rubber is the

Dependent Variable

If I pour vinegar over an egg it will dissolve the eggshell and make it rubber.
I used a Full bottle of Distilled White Vinegar
All The Materials together
2 Eggs: Farm-fresh and Store bought
2 clear plastic cups
I labeled the bottom of each cup and put one egg in a cup and the other egg in the other cup
Final Day
Day 1 - Bubbles of carbon dioxide begins to form like crazy on the eggshell.
Day 1 through Day 7
The purpose of this activity is to see if free-range eggs have a eggshell that is stronger or weaker than a store bought egg.
Materials that were used
Images from each day
Naked Egg Experiment
I used measuring tape to measure the amount of vinegar.
I measured the eggs on day 1 and on day 7
Day 1
Day 1
Day 2 - Farm
Day 2 -Store
Day 2
Day 2
Day 3
Day 1
Day 4 - Farm
Day 4 - Store
Day 5 - Farm
Day 6 -Store
Day 1
Day 7 -Store
Day 7- Farm
Day 7 - Store
Day 7 - Farm
Day 7
Day 7
Something I learned doing this experiment.
After seven days the egg is a bit bigger the when I first started. This is because some of the vinegar has moved through the membrane through the inside of the egg. The membranes are semi- permeable and allow water to move through them.
This is called Osmosis!
The acetic acid (vinegar) reacts with the calcium carbonate in the eggshell and releases a carbon dioxide gas that you see as bubbles on the shell.
CaCO3(s)+2HC2H3Oc(aq)- Ca(C2H3O2)2+H2O(1)+CO(g)
An extension activity:
You can soak your egg in food color and color the inside of your egg if you soak it in some water with food coloring. This is a nice way to verify that the water in the cup is really moving through the egg membrane and not just coloring the outside.
If you want to see your egg get really big, simply put it in a cup filled with water. The makeup of the inside of the egg is around 90% water. If you put the egg in a cup of (100%) water, the water will begin to move inside the egg through the membrane to equalize the amount of water inside and outside of the egg membrane. This process of water moving through a membrane is called osmosis. Osmosis equalizes – or makes the concentration of water on both sides of the egg membrane the same. This means the egg will swell as the water moves inside and get larger.

Day 7- Translucent egg is left after the shell has dissolved
If I were to do this again I would have several cups of eggs. I would have a cup of water, corn syrup, vinegar, food color and water, and soda.
I think the kids would love to watch each day and see the changes and we could graph the differences.
I expected the farm eggshell to dissolve first. So the results were not what I was expecting.
Unanticipated results
were the colors the egg turned. The farm egg had a red tint to it and the store egg turned very yellow.
This experiment was low key so there are only a few safety.
Wear gloves
No running with solution.
Problems During Activity
Measuring the egg was a problem with a tape measure so I used string and laid the string on the tape measure.
Egg Measurements
Problems Setting Up
I did not have any problems setting up my activity
Day 1:
Store egg
- 2 1/2 inches
Day 2:
Farm egg
- 2 inches
Day 3:
Store egg
- 3 inches
Day 4:
Farm egg
- 2 1/2 inche
Full transcript