Lab Results: The Relationship Between Diffusion and Cell Size
The agar/phenolphthalein block before carving… • Phenolphthalein is an acid/ base indicator. It turns pink in the presence of a base and is clear and colorless in acidic solutions. • NaOH was added to the block in addition to the indicator to help turn the block pink.
The “cells”… • The main block was carved into three smaller cubes which represent different sized cells.
Soaking the blocks (“cells”)… • The blocks were soaked in a dilute HCl acid solution for about 10 minutes. • The images show the results emerging during the soaking time.
The results…. • The blocks were removed from the acid solution after 10 minutes, blotted dry, cut open, and the depth of diffusion was measured…