Chapter 0: The Analytical Process (Example)

1. Formulating the Question 2. Selecting Analytical Procedures

3. Sampling

Random Heterogeneous Material

Segregated Heterogeneous Material

4. Sample Preparation

5. Analysis

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

Chapter 2: Tools of the Trade

Mechanical Balance

Electronic Balance

Buoyancy correction - a sample appears lighter than its actual mass by an amount equal to the mass of the air it displaces. Example: Find the true mass of water (density = 1.00 g/mL) if the apparent mass is 100.00g

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.