Ok, I researched it, the skin acts as the barrier of course, and your body is a hypertonic (high in salt) solution and the water is a hypotonic (little salt) the molocules pass into the water through plasmolysis (a type of osmosis in which water moves out of the material) trying to create an isotonic solution where the salinity is the same.
Here is a lab expiriment I did back in freshman biology in highschool explaining it.
Aim
To determine how and under what circumstances materials will transport across the membrane of an egg.
Materials
raw egg, vinegar, Karo syrup, water, 250 mL beaker, graduated cylinder, aluminum foil
Overview
Depending upon the concentration of water in an egg and that in its surrounding environment, water may
diffuse into or out of the egg. The egg will be placed into three different solutions, each with a different
concentration of water, to illustrate this effect.
Procedure
1. Fill the beaker with enough water so that the egg will be completely submerged when placed in
the beaker. Measure the amount of water in the beaker, then place the egg into the beaker and
measure the new height of the water. The difference in these two measurements is the egg's
volume. Record this value in the table below. Place the egg on the digital balance, record its
mass.
2. Using the graduated cylinder, measure 250 mL of vinegar. Pour this vinegar into a beaker.
3. Place the egg into the "Vinegar" beaker. Cover the top of the beaker with a piece of aluminum
foil. Fold the aluminum foil down along the sides of the beaker so that it cannot fall off easily.
4. Allow the "Vinegar" beaker to sit for two days.
5. After two days, carefully remove the egg and determine its volume using the same procedure
as in step #1. Also, pour the contents of the beaker into the graduated cylinder to determine
the volume of vinegar remaining. Place the egg on the digital balance, record its mass. Record
these measurements in the table. Also note any qualitative changes (in color, texture, etc.) which
occurred in the egg.
6. Using the graduated cylinder, measure 250 mL of distilled water. Pour this water into a beaker.
7. Place the egg into the "Water" beaker. As in step #3, cover the top of the beaker with a piece of
aluminum foil and fold it down along the sides so that it cannot fall off.
8. Allow the "Water" beaker to sit for one day.
9. After one day, carefully remove the egg and determine its volume using the same procedure
as in step #1. Also, pour the contents of the beaker into the graduated cylinder to determine
the volume of water remaining. Place the egg on the digital balance, record its mass. Record
these measurements in the table. Also note any qualitative changes (in color, texture, etc.) which
occurred in the egg.
10. Using the graduated cylinder, measure 250 mL of Karo syrup. Pour this glucose solution into a
beaker.
11. Place the egg into the "Glucose" beaker. As in step #3, cover the top of the beaker with a piece of
aluminum foil and fold it down along the sides so that it cannot fall off.
12. Allow the "Glucose" beaker to sit for one day.
13. After one day, carefully remove the egg and measure its volume. Also measure the volume of
sugar solution remaining in the beaker by using the graduated cylinder. Place the egg on the
digital balance, record its mass. Record these values in the table. Make a note of any qualitative
changes which you observe.
14. Using the graduated cylinder, measure 250 mL of distilled water. Pour this water into a beaker.
15. Place the egg into the "Water 2" beaker. As in step #3, cover the top of the beaker with a piece of
aluminum foil and fold it down along the sides so that it cannot fall off.
16. Allow the "Water 2" beaker to sit for one day.
17. After one day, carefully remove the egg and determine its volume using the same procedure
as in step #1. Also, pour the contents of the beaker into the graduated cylinder to determine
the volume of water remaining. Place the egg on the digital balance, record its mass. Record
these measurements in the table. Also note any qualitative changes (in color, texture, etc.) which
occurred in the egg.
Observations
Record the data you gathered on the first and second day in the table below.
Egg (V)
vinegar
Egg (D)
distilled water
Egg (S)
sugar solution
Egg (W2)
distilled water
If you need more space to record qualitative changes do so in the space below.
_____________________________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
_____________________________________________________________________________________________
Volume
before
250 mL
250 mL
250 mL
250 mL
_____________________________________________________________________________________________
_____________________________________________________________________________________________
Definitions of terms
In answering the questions and writing your conclusions, you may wish to use the following terms to
make your answer complete.
.
diffusion - the movement of molecules from an area of high concentration to an area of low
concentration
.
osmosis - the diffusion of water
.
plasmolysis - a type of osmosis in which water moves out of the material
.
deplasmolysis - a type of osmosis in which water moves into the material
.
isotonic solution - a solution with equal concentration of solute inside and outside of the material
.
hypertonic solution - a solution with more solute in the surrounding environment than in the
material
.
hypotonic solution - a solution with less solute in the surrounding environment than in the material
Questions
1. What was the purpose of covering the beakers with aluminum foil?
2. The movement of water from an area of high concentration to an area of low concentration is
called ________________
3. At which points did water flow into the egg? How can you tell?
4. At which points did water flow out of the egg? How do you know?
5. Which solutions (if any) were hypertonic, isotonic, or hypotonic? Explain how you know.
Conclusions
In the space below, write down any conclusions you can draw from this experiment. You may wish to
explain how the data you gathered relates to the qualitative changes you observed in the eggs. You can
also discuss some of the implications of your findings; for instance, why fruits and vegetables are sprayed
with water at a market.
