Osmosis Assignment

For questions 1-3 a cell which is 96% water is placed into the following environments. Answer each question and indicate whether each solution is hypotonic, hypertonic, or isotonic.

A solution of 100% water.
What is the direction of water movement?
Is in the direction of increased solute concentrations.

Does the cell shrink, swell, or have no change in size?
When water diffuses out of the cell, the cell shrinks.

Which type of solution is this?
Hypertonic

A solution of 4% sucrose.
What is the direction of water movement?



Does the cell shrink, swell, or have no change in size?



Which type of solution is this?



A solution of 12% sucrose.
What is the direction of water movement?



Does the cell shrink, swell, or have no change in size?



Which type of solution is this?









Place an “x” in the correct box in the chart below:

Statement
Hypotonic Solution
Hypertonic Solution
Isotonic Solution
The concentration of the solute in the solution is lower than the concentration inside the cell.

x




When a cell is placed in this solution, water will enter the cell causing it to swell.

x




The concentration of the solute in the solution is the same as the concentration inside the cell.




x
The concentration of the solute in the solution is higher than the concentration inside the cell.



x


Putting a plant in this solution will result in water loss and cause the plant to wilt.



x


The cell will shrivel when placed in this type of solution.



x


When a cell is placed in this type of solution, there will be equal amounts of water moving in and out of the cell.





x


Use each of the terms below just once to complete the passage:

glucose
cell membrane
homeostasis
organism
balance
selective permeability

Living cells maintain a homeostasis by controlling what materials enter and leave. Without this ability, the cell cannot maintain balance and will die. The cell must regulate internal concentrations of water, Glucose , and other nutrients and must eliminate waste products. Homeostasis in a cell is maintained by the Cell membrane, which allows only certain particles to pass through and keeps other particles out. This property of a membrane is known as Selective permeability. It allows different cells to carry on different activities within the same Organism.








Egg Osmosis Lab
Students in Biology class conducted a lab experiment to demonstrate osmosis using chicken eggs. The raw eggs were first soaked in vinegar for 24-48 hours to dissolve the shell. What was left was a very simple cell with a cell membrane. The eggs were massed, observed. and the data was recorded in the table below. On the first day of the lab the students placed their eggs into sugar syrup and left them overnight. The next day in the lab the eggs were removed from the syrup, carefully dried, observed, and massed again. Next the eggs were placed in distilled water and left overnight. The following day the eggs were removed from the water, carefully dried, observed, and massed.



Mass of egg (grams)
Appearance of egg
Day 1 (initial)
80.8
Transparent, squishy, feels sort of like a water balloon.
Day 2 (after syrup)
63.2
Egg feels softer and empty or deflated. It has shrunk and appears much more yellow.
Day 3 (after distilled water)
105.3
Egg is very large and feels like it might burst.










Describe what happened to the egg when it was placed into the sugar syrup in terms of osmosis.




Was the sugar syrup a hypertonic, hypotonic, or isotonic solution?




Describe what happened to the egg when it was placed into the distilled water in terms of osmosis.




Was the distilled water a hypertonic, hypotonic, or isotonic solution?