Diffusion of Agar Cubes

Determine which cell size will be the most efficient at obtaining the most amount of nutrients or eliminating wastes

What factors will affect the movement of molecules?

The Dimensions:Area = L*WVolume = L*W*H

Calculate the area and volume for each cube. Remember, alwaysInclude the unit of measure. For area, its is cm2 and volume is cm3.

How do you calculate surface area of a cube?

SA = L*W*6

Here’s the agar cube?

Powdered agar + distilled water +

phenolphtalein

All three agar cubes sat in about 100ml of NaOH. Look at the color of the cubes. Why did they turn pink? The agar cubes contained phenolthalien. This is an indicator that turns a pink color when it reacts with NaOH.

Why did the investigation use phenolthalien?

Let’s Analyze the Results

Calculate the nondiffused area by usingThe formula, A=L*W

Demo Lab

If you have forgotten what was done, click on the link to watch the lab.