Today we did another lab about the concept of diffusion and osmosis. We put three cubes of "cells" in the solution of NaOH after we measured their surface areas, and as you can see in the picture above, the cube's reaction with the solution involves color change. We took the cubes out after 3 minutes.
As you can see, the purple part on the outer layer of the cube was the part involved in the reaction, and the white part in the center of cube wasn't involved. In order to see the difference in color more clearly, we cut all the cubes in half.
We calculated the thickness of the purple part in order to find out the amount of reaction involved. Finally, we discovered that the smaller the volume of the cube is, the faster it reacts with the solution.
- Andy Liu '15
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