I will look at your experiment in stages:
- The first thing you did was to remove the eggshell, this was achieved by
dissolving the shell (a base) in vinegar (an acid).
- Eggs have a layer surrounding them (inside the shell) called a membrane.
This layer allows chemicals to pass into and out of the egg. Water is an
- When your egg was placed in water, the water moved into the egg by a
process called osmosis. The water 'concentration' inside the egg was less than
outside so the water moved in to even things out. This extra water made the
egg swell up.
- When your egg was placed in a sugar solution, the amount of sugar outside
the egg was greater than inside. Water had to travel out in order to balance
things up. Water leaving the egg would make it shrink.
In more scientific language: The substance, sugar, which has a higher solute
concentration than the interior of the eggs, will cause water to leave the
eggs’ membrane; the other substance, distilled water, which has a lower solute
concentration than the eggs’ interior, will cause liquid to enter the eggs’
Hope this helps,