Diffusion and Osmosis Day

We began Honors Bio Day 4 with a short quiz regarding water. Then, we went right into the Diffusion and Osmosis Lab.

Diffusion and Osmosis Lab

1. First, Sid, James, and I created six cells by filling up six plastic bag/tubes with six different solutions and different molarities.

2. Next, we weighed the cells and stuck them in water for 30 minutes.

3. Then, while we were waiting, we filled up six more bag/tubes with Propel and weighed those.

4. After, we stuck those in the different solutions and covered the glasses with parafilm.

5. We then took out the cells and weighed them to get the following mass change percentage (By subtracting the initial mass from the final, then divided by the initial):

Clear 6.7%
Red 20.2%
Yellow 17%
Green 9.5%
Blue -1.3%
Purple 17%

6. Sid came back at night and got the following mass change percentages of the Propel:

-28% for the 5.3

-51% for the other 5.3

-10% for the 5.9

5% for the 4.9

-20% for the 4.77

-37% for the final 5.3

 

 

 

 

The cells after drying them.

The propel in the solutions.

 

 

 Conclusion
The solutions all gained mass in the experiment because of the addition of water through diffusion and osmosis (ignore the negative one, there was a leak). The propel all lost mass, meaning that it had a higher concentration than the surrounding concentration, forcing the water to travel to the lower concentration and out of the Propel bags.