Osmosis Lab Report

This experiment is testing the osmosis of rubes of drinking water after sitting in different solutions for 24 hours. The solutions have different amounts of sugars, or solutes, which will affect the weight of the tubes because of osmosis. The water in the tubes will either exit out to the solution, the water from the solution will enter the tubes, or they will stay equal. By weighing the tubes before and after letting them sit for 24 hours you will see what type of osmosis occurs. But first, you have to come up with a hypothesis, then you can start your experiment!

Our Hypothesis

If the solution contains more solutes, the mass will be less. But if the solution contains less solutes, the mass will be greater.

Variables Used

Independent Variable- the type of solution

Dependent solution- the mass of the tube

Controlled Variables- the amount of water in the tube and the amount of solution in the cup

Steps to the Lab

1. Tie one end of each of the three tubes with a piece of string.

2. Add 10mL of drinking water to the three tubes, then tie the other ends.

3. Add 200mL of original soda to one cup, 200mL of diet soda to another cup, and 200mL of purified water to another cup.

4. Measure the mass of the three tubes with the balance and write them down.

5. Place a tube in each cup.

6. Let them sit for 24 hours.

7. Remove tubes and remeasure them, copying down the new weights.

8. Make a data table showing the difference between the weights before and after sitting for 24 hours.

Our Analysis

The soda has more solutes so the water inside of the tubes went out to the soda, causing them to decrease in weight. The purified water increased in weight because it has less solutes than the drinking water in the dialysis tube.
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