Osmosis and Diffusion
Osmosis and Diffusion are a type of Passive Transport.
Testing It Out
If a tube of drinking water is placed in a cup of distilled water, the mass of the tube will decrease because the solutes will leave the tube making it a hypertonic solution.
If a tube of drinking water is placed in a cup of clear soda, the mass of the tube will increase slightly because the solution (soda) is more isotonic.
If a tube of drinking water is placed in a cup of dark soda (non-diet), the mass of the tube will increase because the solution (soda) is more hypotonic.
Independent Variable: type of solution (distilled water, sodas)
Dependent Variable: mass of the each tube
Control Variables: amount of solution, amount of water within the tube, the type of water in the tube
- using a funnel, pour 15mL of drinking water into a dialysis tubing. Tie the ends of the tubing with a piece of string. Measure the mass of each tube and record it. Label this tube 1.
- Repeat Step 1 two more times with separate tubes. Label each of these 2 and 3.
- Pour 270mL of each solution into three separate cups (be sure to label each appropriately).
- Put the dialysis tubing into each cup.
- Let it sit for 24 hours.
- Take out the tubes and pat them dry (be careful not to squeeze them).
- Measure the mass of each tube and record them in your data table.