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Osmosis and the Egg Lab Report

By ScottP2015 Jun 21, 2015 1334 Words
Osmosis and the Egg Lab Report 
By: N. Mullins 
Date: January 20, 2011 
 
Introduction 
This lab was designed to explain the different things osmosis does. Osmosis is the  diffusion of water across a semi permeable membrane. Over three days we tested the egg  in three different solutions to observe the changes. On Day 1, the main question we  answered was what happened to the egg when it was placed in vinegar? Before doing this  I came to my hypothesis was that the vinegar would eat away at the shell and eventually  dissolve the shell since it is an acidic solution. Things with acid are corrosive and  sometimes poisonous so they eat away at things. On Day 2, the main question we had to  answer was what happens to the egg’s mass when it sits in a water or saltwater solution  for 30 minutes? I hypothesized that the egg will lose grams because the salt will make the  water go outside the cell causing it to shrink. On day 3, the main question we answered  was what happens to the egg’s mass when it sits in a syrup solution for 24 hours? I  hypothesized that it would gain mass because of how thick the syrup solution was.    

Method 
Day 1​
: On day we set up our experiment in the first solution which was vinegar. We 

had to bring a raw egg to school. My partner ( S.) and I placed both of our eggs in a cup  and put our names on the cup. I poured vinegar over our eggs. After that, we placed our  cup where the teacher told us to. 

 
Day 2​
: When we got to class, we got our cups that our eggs were in. We used a spoon  to remove the eggs and rinsed it off carefully and dried it with paper towels. We got two  cups for each egg and first got the mass of the cup and them the mass of each egg plus the  cup. We then determined the mass of the egg alone and recorded the data. I then  predicted if I thought the Egg 1 would gain, lose, or stay the same mass after it was  placed in a cup of water for 30 minutes. Next, I predicted if I thought the Egg 2 would  gain, lose, or stay the same mass after it was placed in a cup of saltwater for 30 minutes.  We then put the water over egg 1 and the saltwater over Egg 2 and waited 30 minutes.  After the 30 minutes was up, we removed the eggs and emptied the solutions. We massed  the eggs once again and recorded the data. I predicted what I thought would happen to the  eggs if they were placed in pancake syrup for 24 hours. We then covered both eggs in  syrup and put them in a safe place.  

 
Day 3​
: When we got to class we grabbed our cups and carefully removed the syrup  from the eggs. We placed a thin disposable tray on the scale and zeroed the scale off. We  then placed Egg 1 on the tray and recorded the mass shown. We repeated that step for  Egg 2 and recorded the mass. After we rinsed off everything we used. We got to have fun 

with the egg after we finished the lab. We broke both eggs shell (what was remaining)  and got to observe the changes in the cytoplasm and nucleus.    

Results 
After putting the cell in vinegar, we noticed that when we observed it, it was very smelly  and soft. We had to be very careful using dealing with it. After putting the cell in water/  saltwater it just looked bigger. It was swollen. After putting the cell in syrup, it looked  rotten and like it could bust any minute.  

 
Here is the Lab Data Chart 
 
 
Egg 1 
Egg 2 
Decalcified egg+ cup 
69.95 g 
70.42 g 
(after being in vinegar) 
 
 
 
1.89 g­ cup 
1.81­ cup 
Decalcified egg alone 
68.06 g 
69.61 g 
 
Prediction of mass of egg 

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