The concept is very simple. First, the students fill dialysis bags with varying concentrations of sugar solutions. The bags are then massed.
Each dialysis bag is placed in a cup of distilled water. The cups are allowed to sit for some period of time. I have the students wait for 30 minutes, pull the bags out of the cups, and determine the final mass of the bag. We get very good results in just thirty minutes. If necessary, you can leave them overnight and get the final mass the next day.
Results are graphed showing the direct relationship between solute concentration and rate of diffusion.
This is one of my favorite labs and is a free download. I hope you doing this lab as much as I.
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