Day 4: Diffusion and Osmosis Lab

We started the class by taking a short, easy quiz on the properties of water that we had previously discussed.

We then reviewed the information about diffusion, osmosis, and the lab that we had learned from our homework.

Then, we started work on our lab.

First, we used diffusion membrane to form "cells" with 6 different types of liquid in them. We massed each cell, placed water over each one, and then let them set for 30 minutes. Finally, we massed each cell and calculated the % mass change to see how much water had diffused into the cell.  From this information, we were then able to calculate the molarity of each solution.

Next, my section of the group did section #3 of the lab, in which we tried to determine the molarity of a sweet potato. We first massed pieces of potatoes and put 4 pieces each in 6 cups. We covered the potatoes in each cup with water and let them sit (covered to prevent evaporation) for around 9-10 hours. We once again massed the potatoes and calculated the % mass change  and used the information from the first section determine the molarity of the potatoes.