By: Marty Madar
This lab was created to demonstrate how osmosis works. It's supposed to show how hypertonic and hypotonic solutions work. It will show what happens when an object is placed in a solution that has a higher or lower concentration.
The independent variable of this experiment would be the type of solution. The dependent variable would be the mass of the dialysis tube, which is what's measured. The control variables are the amount of water in the tube, the amount of solution poured into the cup, and how long the dialysis tube is left in the solution.
2) Add 10 mL of drinking water to the three tubes, then tie the other ends.
3) Add 200 mL of regular soda into one cup, 200 mL of diet soda to another cup, and 200 mL of distilled water into another cup.
4) Measure the mass of three dialysis tubes with the balance and write them on the side of the cup and in a data table.
5) Place one tube in each of the three cups.
6) Let it sit for 24 hours.
7) Remove the tubes and measure the mass again.
8) Record the differences.