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Chapter 0:The Analytical Process (Example)
1. Formulating the Question
2. Selecting Analytical Procedures
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3. Sampling
Random Heterogeneous Material
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Segregated Heterogeneous Material
4. Sample Preparation
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5. Analysis
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6. Reporting and Interpretation
7. Drawing Conclusions
Terminology to Know From the Example
representative sampling – random vs. segregated
sample preparation
extraction, centrifugation, filtering
chromatography, stationary phase, adsorption
aliquot
calibration curve
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Chapter 2:
Tools of the Trade
Mechanical Balance
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Electronic Balance
Buoyancy correction - a sample appears lighter than its actual mass by an amount equal to the mass of the air it displaces.
d
d
d
dm
ma
w
a
1
1'
Example: Find the true mass of water (density = 1.00 g/mL) if the apparent mass is 100.00g
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Calibration of Volumetric Glassware
True volume = mass H2O x correction factor
Example p. 49: an empty weighing bottle had a mass of 10.283 g. After water was added from a 25-mL pipet, the mass was 35.225 g. The temperature was 23oC. Find the volume of water delivered by the pipet.