Egg Lab
Wednesday November 09th 2011, 6:53 pm
Filed under: Uncategorized

Background: The purpose of this experiment is to determine which of the solutions (15% salt, 5% salt, or distilled water) will make the egg weigh more because of Osmosis. Osmosis travels from High concentration to low concentration. That is why the egg will soak up all the water outside and become heavier.
The egg that has been sitting in the 15% salt solution will weight more because the egg will soak up all the water outside and become heavier through Osmosis. Water will diffuse inward of the cell when it is Hypotonic (15% salt solution). Water will diffuse outwards the cell when it is Hypertonic (5% salt solution). Water will diffuse both outward and inward the cell when it is Isotonic (distilled water solution). The particles will move towards the cell. One example of Passive transport is Facilitated diffusion.
Question:  Based on the salt in the solution and the diffusion of osmosis how much will the weight of each egg differ?
Hypothesis: If the egg is put in distill water the weight will not change because things are exiting and entering equally. If an egg is put in 5% salt solution the egg will come out heavier because of osmosis. If an egg is put in 15% salt solution then it will come out lighter because the salt is withdrawing most of the vinegar.

Procedure:

  1. Gather materials
  2. Obtain egg from vinegar soak
  3. Weigh the egg to find original weight
  4. Get a flask of 30 ml of each different salt solution.
  5. Put egg in each solution for 30 minutes.
  6. After 30 minutes weigh each egg and see the difference.
  7. Record information

Variables:
Dependent: The eggs, the weight, water amount
Independent: The salt solution

Controls: The water solution, amount in ml, and amount of salt.

Constants: The egg and the initial weight.

Data Table:

Egg Solution Start weight Final weight
1 Distilled 84.81 100.99
2 5% salt 84.81 96.5
3 15% salt 84.81 87.76
         
Materials:
    • Three declassified eggs per group
    • Distilled water, 5% salt water, 15% salt water (you will use 150 mL of each solution)
    • Up to three 250ml beakers per group
    • Masking tape
    • Spoon
    • Sharpies
    • Weighing boats
    • Balance
    • Chrome-books/Mac Airs
    • One class period to complete lab
Conclusion: The egg weighed more when it was in the distilled water and less when it was in the 15% salt solution.
Our hypothesis was: “If the egg is put in the distilled water the weight won’t change because things are exiting and entering equally, if an egg is put in 5% salt solution the egg will come out heavier because of osmosis, and if the egg is put in 15% salt solution then it will come out lighter because the salt is withdrawing most of the vinegar.” The distilled water was the one that changed the most. When the egg was put in 5% salt solution the egg did come out heavier then the 15% salt solution.
Based on the salt in the solution and the diffusion of osmosis, the weight for 15% of salt differed by 2.95 grams, the weight for 5% of salt differed by 11.69 grams, and the weight for the distilled water differed by 16.18 grams.
Some things we could have done better on or improve on for next time is we could time our lab better. When we timed our eggs from when we put them in the salt solution to when we took the eggs out, we were a bit late taking the eggs out and because we put all three eggs in at the same time it required 3 different people. One of us put the egg in before the time had been started and we all took them out at different times. They were only a few seconds off but it most likely still affected our lab.




     
1 Comment so far

T: 5
WE: 4

SP: procedure is not quite detailed enough; variables not correct; some information about the egg and why we are using it would be helpful as well as what direction particles move during osmosis; 1

DC: good graph; some qualitative data would be helpful; conclusion uses data but doesn’t explain why the eggs changed mass (this is the most important part); 1

AS: nothing here 1

Transport Standard 2: nothing to meet 1

   drott22 on 11.12.11 @ 10:03 pm    Reply


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