21-day Eggciting Adventure: Day 5
Welcome Back Goat Life Farmer's!
Today we are going to do an Eggciting eggsperiment!
What you will need:
1- plastic cup or glass jar
1- bottle white vinegar
Instructions1. Place the egg in the glass jar
Make sure your jar is not heavy and let kids handle them easily. Ask them to place the egg into the glass jar. Ensure it does not break and provide help to kids. Preferably use a wide-mouthed glass so that easily hands can go inside. Also, there will be rooms for the egg to swell.2. Mix Vinegar Solution
Now, take vinegar and transfer that to the jar until it covers the entire egg. Finally, add few more drops to make sure that eggs are floating. Initially, the egg will float when it is fresh and then sink.
Have the kids write down their observations and their hypothesis, Make this a fun science experiment!
The fun begins quickly after adding the vinegar to the jar and you can witness minute bubble formation on outer layer of the egg. This is due to the release of CO2 (carbon dioxide). Imagine the fizzy sound when opening any aerated juice. This is similar to that chemical reaction which happens n the jar.
4. Close the jar and keep it aside for a maximum of 7 days
Osmosis takes places making the egg to swell and also the color of the eggshell fades from brown. A scummy layer is formed on the surface and it is good to change the Vinegar solution when you witness this layer formation. However, it is optional and does not bother if you forgot to do it or just don’t have time.
5.It’s time to empty the vinegar from the jar and take the egg outside. Wash off the residual eggshell.
Wow! You can see the naked egg without eggshell. It is now soft like a sponge and light in weight. In case, the eggshells are hard to remove, then don’t panic it needs more days and some more vinegar. So wait with patience to enjoy watching and touching the naked egg soft as a sponge.
These are cool to look at and also you can find the intact membrane inside. It feels rubbery to touch and squeezing them gently adds fun. It is now possible to see through the lucid egg which contains the yolk. Also, they are seen floating on the top.
Replace your rubber ball with this shell-less egg and dropping from a height of one inch is safe. Yes, it bounces. Be prepared to clean the mess as well. It might turn out to be a mess if you mishandle or kids put more pressure out of excitement.
The science behind the disappearing egg shell:
The reaction between an acid solution and a base can be demonstrated using this activity. The acetic acid present in vinegar reacts with the shell which is nothing but calcium carbonate. Therefore vinegar is acidic and eggshell is the base.
The reaction between acetic acid + calcium carbonate forms a compound that is soluble in water and named as calcium acetate. Along with this CO2 is released. Thus the eggshell gets dissolved and the inner membrane remains unaltered giving an appearance of an exposed egg.
Slowly add vinegar solution to the glass jar with egg to see the reaction. The appearance of CO2 begins and seen small bubbles.
Inside the Egg
Day 5: Sensible increase in the embryo’s size; the embryo takes a C shape: the head moves closer to the tail. Extension of limbs. Differentiation of the fingers of the inferior limbs.