Day 4: Diffusion and Osmosis Lab

Diffusion: All molecules are in motion and diffusion is the movement of molecules from an area of high concentration to an area of low concentration.

Osmosis: is a specialized type of diffusion which involves the transport if water thru a permeate membrane from a region of high concentration to a region of low concentration. Only some molecules are allowed to move thru the membrane.

Hypotonic: is a lower solute concentration(more water)
Hypertonic- is a higher solute concentration (less water)

Water moves from Hypotonic to Hypertonic

We began our lab in class

 Part 2: We were to determine the molarity of different color solutions ( red, blue, green, yellow, clear, purple) using dialysis tubes and water.

We placed one tube of each in water for 30 minutes and recorded the mass change. And then got the molarities for each:

Color	Mass Before	Mass After	Percent Change	Molarity
Clear	7.3g	7.9g	8.21%	.2M
Purple	8.1g	9.8g	20.988%	.8M
Yellow	7.6g	9.2g	21.053%	.6M
Red	8.1g	10.3g	27.162%	1M
Blue	7.3g	7.3g	0%	0M
Green	7.4g	8.4g	13.514%	.4M

This is what the tubes looked like afterward they were all more full after other than blue which didn't fill:

We also set up our energy drink (powerade experiment) and we saw what happened to them later that night.

This is what the powerade dialysis tubes looked like when we placed them in the cups of the different color solutions:

This is what the powerade tubes looked like after several hours and there was a color change and a decrease in mass:

 This was the percent mass change for the powerade:

Blue: 9.83%

Clear: -4.91%

Green:-22.95%

Yellow:-32.72%

Purple:-32.75%

Red:-54.09%

The other pair in our group Chris and Daniel peeled potatoes and dropped it in the solutions and waited several hours as well. This is their results:

Blue:21.95%

Clear:5.88%

Green:-36.67%

Yellow:-36%

Purple:-39.13%

Red:-66.67%