# ap bio chapter 8

Topics: Concentration, Osmosis, Solution Pages: 4 (823 words) Published: November 15, 2013

The Effect of Molarity on Diffusion in a Potato
Data: Day 1
The effect the Model Cell has on the End Weight
Model Cell(IV)
Surrounding Environment
Start Weight
End Weight(DV)
Change in Weight
Water
Glucose
15.50g
15.97g
.47g
NaCl
Glucose
16.70g
16.94g
.24g
Glucose
Glucose
16.51g
17.75g
1.24g
Albumin
Glucose
14.90g
15.36g
.46g
Water
Water
15.99g
17.48g
1.49g
Observations: The water and Water seemed to have no difference. All model cells had a positive gain of weight.

Data: Day 2
The Effect of Molarity on Diffusion in a Potato
Molarity
Cup Color
Potato
End Weight
% change
0M
Green
32.18g
37.00g
14.97%
.2M
Clear
36.07g
37.60g
4.24%
.4M
Yellow
27.99g
25.89g
-7.50%
.6M
Red
33.08g
27.79g
-15.99%
.8M
Blue
43.99g
34.44g
-21.70%
1M
Purple
29.81g
22.23g
-25.42%
Observations: Potato floated in purple and blue color when it was put in. Potatoes were lighter in after being put in the Red.
The potatoes in Green, Yellow, and Clear sank to the bottom.

Analysis:
Day 1: Depending on what the Independent Variable is (Model Cell) then the Dependent Variable (End Weight) will change on what the Model Cell is? There was a significant difference because I would have thought water in water would have no change but it had the most change. Day 2: Depending on what the Molarity of the liquid is will determine the diffusion change in the potato. The higher the Molarity is in the liquid then the diffusion will have a less of a change.

Conclusion:
Day 1: If a different Model Cell is put into a Surrounding Environment then the end weight will be less from the beginning weight except in the control group (Water to Water). This hypothesis was reject because when water was put in glucose the starting weight was 15.50g and then after 30 minutes the weight was 15.97g. When Albumin was put in Glucose the starting weight was 14.90g and after 30 minutes the end weight was 15.36g. But what was surprising is when the...