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Chapter 2

CHEM 14BL Chapter Notes - Chapter 2: Cuvette, Atomic Mass, Absorbance


Department
Chemistry and Biochemistry
Course Code
CHEM 14BL
Professor
Henary Maher
Chapter
2

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Mia Lim Worksheet #2
mialimaap@gmail.com Week 2 Session B
1
Post-Lab Considerations
Absolute Errors in Lab Equipment:
5.00 mL pipet: ± 0.01 mL
10.00 mL pipet: ± 0.02 mL
Digital balance: ± 0.2 mg = ± 0.0002 g
50.00 mL volumetric flask: ± 0.04 mL
100.00 mL volumetric flask: ± 0.08 mL
25.00 mL buret: ± 0.03 mL
*You will be using these absolute errors in your pre-labs and post-labs. This is located on page
27 of your lab manual.*
Systematic error:
o Examples in pipet lab:
Random error:
o Examples in pipet lab:
Relationship between % RAD and % Inherent Error
Purpose of Calibration: to check experimenter’s precision/ accuracy of lab equipment.
A comparison between % RAD and % inherent error is used to check if the experiment was
performed within the precision warranted by the equipment.
% RAD = ……………………………………………
% inherent error = ……………………………………………

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Mia Lim Worksheet #2
mialimaap@gmail.com Week 2 Session B
2
Comparison
Meaning
% RAD ≤ % Inherent error
% RAD > % Inherent error
Application of % RAD and % Inherent Error
Example: Using a 10-mL volumetric pipet, a student obtained the following amounts of water based on three trials:
10.10 mL, 10.02 mL, and 10.50 mL. The absolute error associated with a 10-mL volumetric pipet is ±0.02 mL.
What can you conclude about the experimenter’s results? Should the experimenter repeat the experiment?
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