Egg and Vinegar Lab

This is a write-up of the egg and vinegar lab we did as well as some pictures of it. From this lab I learned how chemical reactions can occur among different substances and what results they produce. This lab was a really cool way to learn about reactions.

Egg and Vinegar Lab Report
By Cassidy Smith and Marisa Bourgeois
Period 4
Purpose/Question-
What will happen when we put a raw egg into a beaker of vinegar?

Materials-
– One raw egg
– Beaker
– 200 ml of vinegar
– Paper towels
– Pencil (to poke the egg)
– Microscope (optional)

Research-
We had prior knowledge of this experiment because we did a similar one in seventh grade. So, no research needed to be done. We had a vague idea of what was going to happen, and what to do for the experiment.

Hypothesis-
We think that the vinegar will dissolve the egg shell over the course of twenty- four hours.

Procedure-
1) Assemble all lab materials
2) Put the egg into your beaker
3) Put the vinegar into the same beaker as the egg
4) Record observations
5) Let beaker and it’s contents sit for twenty-four hours
6) After the time has passed, take the whole beaker and observe and record what is happening
7) Do any desired tests on the egg (Ex. poking it, dropping it, bouncing it, etc.)
8) Record observations
9) Use microscope to look at membrane if desired
10) Dispose of egg, vinegar, membrane, etc.
11) Clean area

Observations/ Data-
Day 1 Observations:
– There are tiny bubbles on the surface of the egg shell and on the surface of the vinegar
– The egg sunk to the bottom of the beaker
– There is a dark spot on the top of the egg
– The dark spot may be the shell beginning to peel off
– It is getting gradually larger
Day 2 Observations:
– There is a pretty thick layer of foam on the surface of the vinegar
– The shell came off completely
– The egg is much larger than it was when we originally put it into the beaker
– There is just 150 milliliters of vinegar left in the beaker, meaning 50 milliliters of it are in the egg
– The egg is squishy
– The egg has no shell, and it is encased the egg’s cell membrane
– We poked a small hole in the egg, and a few drops of the insides came out, so we squeezed the rest of them out
– The membrane stayed intact
*

*

Data Analysis-
Our data shows that when you put an egg in vinegar, it will dissolve, the egg’s shell. It took the vinegar about twenty-four hours to dissolve in the vinegar. Egg shells dissolve in vinegar because vinegar is composed of three percent acetic acid, and egg shells are made of calcium carbonate. When the acetic acid reacts with the calcium carbonate, they combine to form carbon dioxide. So, the egg shell turned into carbon dioxide, which was also the bubbles that we were seeing on the surface of the vinegar.

Conclusion-
We agree with our hypothesis on this experiment because our hypothesis said that the vinegar would dissolve the egg shell, and that is exactly what happened. We observed two different scientific occurrences in this experiment. One was chemical reactions (the egg shell dissolving in the vinegar), and the other was osmosis (the vinegar going into the egg because of the concentration). The one area of this lab where measurable experimental error could have occurred would be at the beginning of the lab when we put the vinegar in the beaker. We could have measured the volume of the vinegar incorrectly. This would affect the final result of the experiment because if we put more or less vinegar than we thought we did into the beaker, then the results after the twenty-four hours could have turned out completely different.

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