Egg Osmosis Lab
Purpose To explore transport of materials in three semi-permeable membranes: dialysis tubing, eggs, and onion cells.
Background Information 1. Diffusion is the movement of solutes from high to low concentration. Osmosis is the movement of water from low to high concentration. Both refer to movement in/out of a cell, but osmosis refers specifically to water.
2. Isotonic, hypertonic, and hypotonic all refer to the comparison of concentrations of solutes in verses out of the cell. Isotonic is when the concentration in the cell is the same as the concentration outside of the cell. Hypertonic is when the concentration outside of the cell is greater than inside. And hypotonic is the opposite; the concentration outside of the cell is less than inside of the cell. …show more content…
After the egg is placed in molasses, the width will be similar, and the mass will be larger. After the egg is placed in water, the mass and width will be larger.
Procedure C: The onion in salt water will look “parched” compared to the onion in distilled water. The whole cell will be smaller and shriveled.
Materials Dialysis tubing, starch solution, iodine solution, raw egg, vinegar, molasses, onion, and salt water.
Procedure See lab procedure
Observations Procedure A: At the beginning of the procedure, the iodine solution in the beaker was slightly yellow, and the starch solution in the dialysis tubing was milky. After about an hour, the inside of the dialysis tubing was very blue and the liquid in the beaker was clear and colourless.
Procedure B:
Egg
Starting Weight
Vinegar
Molasses
Water
Weight
57.92 g
77.98 g
53.38 g
85.51 g
Width
13.5 cm
15.6 cm
13.6 cm
15.5 cm
Description
- hard, round, white
- squishy, slightly clear,
Background Information 1. Diffusion is the movement of solutes from high to low concentration. Osmosis is the movement of water from low to high concentration. Both refer to movement in/out of a cell, but osmosis refers specifically to water.
2. Isotonic, hypertonic, and hypotonic all refer to the comparison of concentrations of solutes in verses out of the cell. Isotonic is when the concentration in the cell is the same as the concentration outside of the cell. Hypertonic is when the concentration outside of the cell is greater than inside. And hypotonic is the opposite; the concentration outside of the cell is less than inside of the cell. …show more content…
After the egg is placed in molasses, the width will be similar, and the mass will be larger. After the egg is placed in water, the mass and width will be larger.
Procedure C: The onion in salt water will look “parched” compared to the onion in distilled water. The whole cell will be smaller and shriveled.
Materials Dialysis tubing, starch solution, iodine solution, raw egg, vinegar, molasses, onion, and salt water.
Procedure See lab procedure
Observations Procedure A: At the beginning of the procedure, the iodine solution in the beaker was slightly yellow, and the starch solution in the dialysis tubing was milky. After about an hour, the inside of the dialysis tubing was very blue and the liquid in the beaker was clear and colourless.
Procedure B:
Egg
Starting Weight
Vinegar
Molasses
Water
Weight
57.92 g
77.98 g
53.38 g
85.51 g
Width
13.5 cm
15.6 cm
13.6 cm
15.5 cm
Description
- hard, round, white
- squishy, slightly clear,