Osmosis in a Chicken Egg
Diffusion – Movement of molecules from a high concentration
to a low concentration
Osmosis – Movement of water molecules from a high
concentration to a low concentration
Selectively Permeable Membrane - Will allow certain
molecules and ions to pass through via diffusion while
Solution – A homogeneous mixture composed of two or more
substances. The solution that forms has the same physical
state as the solvent.
Examples - Salt water, Sugar water, Air
Mixture – One compound is added to another and no
chemical bond is formed
Solvent – Substance that dissolves another solid, liquid, or
Solute – Substance dissolved by solvent
Types of Solutions
Hypotonic – contains less solute (more water) compared to
another solution. Water diffuses across a semi-permeable
membrane OUT OF a hypotonic solution. (into egg)
Hypertonic – contains more solutes (less water) compared to
another solution. Water diffusion across a semi-permeable
membrane INTO a hypertonic solution (out of egg)
Isotonic – two solutions have the same concentration of solutes
(equate amounts of water), so there is NO NET MOVEMENT
of water across a semi-permeable membrane.
Vinegar contains acetic acid, which breaks apart the solid calcium
You will need to be very careful with these eggs now that the
shell has been removed. You will clean up any mess
Treatment – You will be placing your eggs into four
different concentrations of sucrose
0% (distilled water)
Unknown sucrose solution.
Come up with a hypothesis for the net movement of water
in each solution. Include the following.
Which direction water will move (into or out of the egg)
What will happen to the weight of the cell
What type of solution do you think each represents (hypertonic,
hypotonic, or isotonic)
As a group come up with an SPECIAL
What would you like to see an egg placed in
It must be something we can find in the
Propose these to Mr. Lynch if it is possible
we will try this as well.
In your group obtain four shell-less chicken eggs
from Mr. Lynch. Handle them gently so the shell
membranes remain intact. (Remember you will
clean up any mess)
Gently dry each egg and weigh them
Place one egg in each of the sucrose treatment bins.
Ask for help with your special treatment.