Membrane functions lab report
Membrane Functions:
Aim:
To demonstrate the process of osmosis using a chicken’s egg
Hypothesis: I predict that the egg’s mass after 10 min. in the 5% salt solution would increase due to and balancing out the solution. In the 10% salt solution, the egg’s mass would decrease since there is a high amount of salt. In the dilute water solution, the egg’s mass will increase, as the membrane would take in that water.
Materials:
1- One fresh egg
2- One plastic spoon
3- One plastic fork
4- One plastic plate
5- Sink (for rinsing)
6- 200 mL distilled water
7- 200 mL 10% NaCl solution
8- 200 mL 5% NaCl solution 9- 200 mL dilute HCl 10- 4 x 300 mL beakers 11- Paper towels 12- Electric scale
Procedure :
1- Place the egg inside the beaker with dilute acid and leave it overnight to remove the hard shell around it.
2- Remove the egg from the beaker filled with acid using a spoon, and rinse it carefully under tap water.
3- On a paper towel, pat it dry carefully.
4- Place the egg on the scale and measure its mass, record it in your data table.
5- Place the egg in the beaker filled with 200 mL 5% salt solution and leave it for 10 minutes.
6- Repeat steps 3-4. Calculate the change in mass and also write it down in your table. Also record any other observations.
7- Place the egg in the beaker filled with 200 mL 10% salt solution and leave it for 10 minutes.
8- Calculate the change in mass between the solution with 5% and solution with 10%.
9- Place the egg in the beaker filled with the distilled water and leave it for 10 minutes. 10- Calculate the change in mass between the solution with 10% and the distilled water. Also record any other observations.
Data collection and Processing:
Quantitative data:
The effect of different concentrations on the mass of the egg.
Different concentrations of NaCl
Initial Mass(g) ±0.01
Final Mass(g) ±0.01
Difference in mass (g) ±0.01
NaCl (5%)
72.8
Aim:
To demonstrate the process of osmosis using a chicken’s egg
Hypothesis: I predict that the egg’s mass after 10 min. in the 5% salt solution would increase due to and balancing out the solution. In the 10% salt solution, the egg’s mass would decrease since there is a high amount of salt. In the dilute water solution, the egg’s mass will increase, as the membrane would take in that water.
Materials:
1- One fresh egg
2- One plastic spoon
3- One plastic fork
4- One plastic plate
5- Sink (for rinsing)
6- 200 mL distilled water
7- 200 mL 10% NaCl solution
8- 200 mL 5% NaCl solution 9- 200 mL dilute HCl 10- 4 x 300 mL beakers 11- Paper towels 12- Electric scale
Procedure :
1- Place the egg inside the beaker with dilute acid and leave it overnight to remove the hard shell around it.
2- Remove the egg from the beaker filled with acid using a spoon, and rinse it carefully under tap water.
3- On a paper towel, pat it dry carefully.
4- Place the egg on the scale and measure its mass, record it in your data table.
5- Place the egg in the beaker filled with 200 mL 5% salt solution and leave it for 10 minutes.
6- Repeat steps 3-4. Calculate the change in mass and also write it down in your table. Also record any other observations.
7- Place the egg in the beaker filled with 200 mL 10% salt solution and leave it for 10 minutes.
8- Calculate the change in mass between the solution with 5% and solution with 10%.
9- Place the egg in the beaker filled with the distilled water and leave it for 10 minutes. 10- Calculate the change in mass between the solution with 10% and the distilled water. Also record any other observations.
Data collection and Processing:
Quantitative data:
The effect of different concentrations on the mass of the egg.
Different concentrations of NaCl
Initial Mass(g) ±0.01
Final Mass(g) ±0.01
Difference in mass (g) ±0.01
NaCl (5%)
72.8