Lab Notebook: Diffusion & Osmosis
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1) Title & Date
2) Pre-Lab (Key Concepts, Equations, Materials List)
3) Purposes (2-3)
4) Personal Account
– Part I: Procedure, data table
– Part II: Hypothesis, procedure, I.V. & D.V., ID control vs.
experimental groups, data table, line graph,
calculations/equations
• 5) Discussion (answers to ALL ?s for BOTH parts of lab)
• 6) Conclusion
Potential materials…
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Unknown solutions (A-E)
Distilled water
Dialysis Tubing
Pipets
Beakers
Scales
Paper Towels
Clock
Good Experimental Design
1. Hypothesis – “If…then…”
2. Independent & dependent variables
- IV: sucrose sol’ns
DV: % change in mass
3. Control group: H2O
Experimental group: A - E
4. Constants:
- same temp – Room Temperature
- same volume – 10 mL in bag…..’excess’ of H2O in cup
- equipment – scales, pipets, etc.
- Time – 15 min
% change = F-I x 100
5. Random sampling – N/A
I
6. Large sample size – classes all day
7. Repeated – classes all day
8. Graph
When massing bag, blot off outside. Only inside contents matter.
Yes, you may use your one phone per pair as a timer.
Be sure to find the slide that
aligns with your class period!!!
2015-- 1ST PERIOD Diffusion & Osmosis
Lab Data
A
B
C
D
E
Control
% change
12.61%
8.49%
5.76%
20.5%
20%
0%
% change
12.15%
8.57%
3.7%
17.6%
14.54%
0%
% change
12.8%
7.87%
4.81%
17.39%
18.3%
8.3%
4.8%
18.5%
17.6%
Average % 12.5%
change
0%
2015– 2nd PERIOD Diffusion & Osmosis
Lab Data
A
B
C
D
E
Control
% change
10.19%
9.43%
4.9%
14%
11.11%
0%
% change
10.19%
6.60%
3.8%
14.9%
10.71%
.96%
% change
8.65%
8.49%
2.88%
16.66%
13.3%
%
8.2%
3.9%
15.2%
11.7%
0.48%
Average % 9.7%
change
2015– 3rd PERIOD Diffusion & Osmosis
Lab Data
A
B
C
D
E
Control
% change
9.26%
6.542%
5.71%
12.5%
11.82%
.95%
% change
7.27%
5.6%
3.8%
7.0%
9.65%
0%
% change
%
%
%
%
%
%
6.1%
4.8%
9.8%
10.7%
0.48%
Average % 8.3%
change
2015– 4th PERIOD Diffusion & Osmosis
Lab Data
A
B
C
% change
9.09%
7.55%
3.77%
14.16%
11.13%
%
% change
9.35%
6.54%
3.64%
13.39%
16.346%
-0.952%
% change
%
%
%
%
%
%
7.05%
3.71%
13.78%
13.74%
-0.48%
Average % 9.22%
change
D
E
Control
2015– 6th PERIOD Diffusion & Osmosis
Lab Data
A
B
C
D
E
Control
% change
11.9%
7.3%
5.77%
15.7%
10.00%
3.81%
% change
8.41%
7.62%
7.69%
20.33%
12.38%
0%
% change
19.61%
7.5%
%
%
%
%
7.47%
6.73%
18.02%
11.19%
1.90%
Average % 13.3%
change