Diffusion lab
Background: The cell membrane determines which chemicals can diffuse into or out of a cell. As chemicals pass through the membrane they move from areas of high and concentration to areas of low concentration. Cells in hypertonic solutions have solute concentrations lower than the solution that bathes them. This concentration difference causes water to move out of the cell into the solution. Cells in hypotonic solutions have solute concentrations greater than the solution that bathes them. This concentration difference causes water to move from the solution into the cell. The movement of water into and out of a cell through a cell membrane is called osmosis.
Purpose: To determine what happens to a cell put in a hypotonic and hypertonic solution
Hypothesis: (What will happen to the egg put in water and the one put in syrup)
Materials: Beakers, Eggs, Water, Syrup, Vinegar, triple beam balance
Data:
Table 1: Eggs in Vinegar
Egg / Mass of egg w/ shell / Observation after 24h / Mass after 24h1.
2.
Table 2
Egg / Liquid / Predicted change before 24h / Observations after 24h / Final mass of egg1.
2.
Analysis:
1. What effect did the vinegar have on the eggs?
2. Why did the mass of the egg increase after soaking in the vinegar solution?
3. What caused the change in appearance in Egg 1 after it soaked in water?
4. How did your results compare to what you predicted would happen?
5. What moved through the membrane of egg 2 after it soaked in the syrup, and in what direction did it move?
6. Which egg was in a hypertonic solution? Explain.
7. Which egg was in a hypotonic solution? Explain.
Conclusion: Explain what you learned from doing this lab
Diffusion lab
Background: The cell membrane determines which chemicals can diffuse into or out of a cell. As chemicals pass through the membrane they move from areas of high and concentration to areas of low concentration. Cells in hypertonic solutions have solute concentrations lower than the solution that bathes them. This concentration difference causes water to move out of the cell into the solution. Cells in hypotonic solutions have solute concentrations greater than the solution that bathes them. This concentration difference causes water to move from the solution into the cell. The movement of water into and out of a cell through a cell membrane is called osmosis.
Purpose: To determine what happens to a cell put in a hypotonic and hypertonic solution
Hypothesis: (What will happen to the egg put in water and the one put in syrup)
Materials: Beakers, Eggs, Water, Syrup, Vinegar, triple beam balance
Data:
Table 1: Eggs in Vinegar
Egg / Mass of egg w/ shell / Observation after 24h / Mass after 24h1.
2.
Table 2
Egg / Liquid / Predicted change before 24h / Observations after 24h / Final mass of egg1.
2.
Analysis:
8. What effect did the vinegar have on the eggs?
9. Why did the mass of the egg increase after soaking in the vinegar solution?
10. What caused the change in appearance in Egg 1 after it soaked in water?
11. How did your results compare to what you predicted would happen?
12. What moved through the membrane of egg 2 after it soaked in the syrup, and in what direction did it move?
13. Which egg was in a hypertonic solution? Explain.
14. Which egg was in a hypotonic solution? Explain.
Conclusion: Explain what you learned from doing this lab