Water Osmosis And Diffusion Lab Report

Alisha Prakash Biol 111-513
The Properties of Water; Osmosis and Diffusion
Hypothesis: When animal and plant cells are placed in a solution, the movement of water is effected by the solute concentration of the solution. If animal and plant cells are placed in a more concentrated solution, the solution becomes hypertonic to the cells, causing water to exit the cells. This changes the appearance of the cells, causing the cells to look darker (more concentrated) and shriveled up.
Null Hypothesis: When animal and plant cells are placed in a solution, the movement of water is not effected by the solute concentration of the solution. If animal and plant cells are placed in a more concentrated solution, the solution will not become hypertonic to the cells and water will not exit the cells. The appearance of the cells will stay the same.
1 mL of 300 mM NaCl is added to tube 1, 0.50 mL of 300 mM NaCl and 0.50 mL of distilled water are added to tube 2, and 1 mL of just distilled water is added to tube 3. After waiting 5 minutes. Observations and results are recorded. For the plant cells, 3 slides are set up and viewed under a microscope. Using forceps, three tiny leaves from an elodea plant are removed. 3 slides are made: one with elodea mounted in distilled water, one with elodea mounted in 0.9% saline solution, and one with elodea mounted in 5% saline solution. Observations are