Egg Osmosis Lab Team__________________Per____
Purpose: The purpose of this lab is to demonstrate what happens when an animal cell is exposed to varying osmotic conditions
What happens when a cell is subjected to a solution where the water concentration is higher than that inside a cell (hypotonic solution)?
What happens when a cell is subjected to a solution where the water concentration is lower than that inside a cell (hypertonic solution)?
What happens when a cell is subjected to a solution where the water concentration is equal to that inside a cell (isotonic solution)?
The cell is like a salty sea that is mostly water. The cell membrane in an animal cell is both a protective barrier and a filter to keep unwanted materials out and bring needed materials inside. Water can move freely through the cell membrane with osmosis. So can small molecules such as sodium and calcium ions. Large molecules like polysaccharides and proteins need assistance in moving through the cell membrane. In this experiment, you will be looking at the movement of water.
Your teacher has soaked the eggs in vinegar. This dissolves the hard shell and leaves a soft outer covering that acts like the cell membrane of a cell.
1. Mark the cup with a sharpie with your period number, group initials, and the first soaking solution (water, vinegar, or corn syrup).
2. One group member should take one egg from the soaking container. Each egg should be rinsed under the tap and gently patted dry.
3. Weigh the egg and place the egg in the container. (The egg’s weight must be identified with the solution in order for the experiment to work).
4. Record weight in the table in the data section.
5. Gently pour a solution into the container so that the egg is covered to about ¾. Record the weight in your lab book.
6. Put on a tray...