lecture 1

lecture 1 - CHEM 6BL Experiment 1: Gravimetry Dr. Sandrine...

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CHEM 6BL Experiment 1: Gravimetry Dr. Sandrine Berniolles 1 1 Experiment 1: Gravimetric Analysis Experiment 1: Gravimetric Analysis z Analytical Chemistry: Fundamental branch of chemistry that involves either: - Identifying the components that make up a compound (qualitative analysis) - Determining the specific amount of a compound (quantitative analysis) z Quantitative Analysis: Gravimetry Gravimetry is the measurement of masses or densities 2 Gravimetric Analysis Methods Gravimetric Analysis Methods z Two primary ways of gravimetric analysis Combustion: collect the resulting residues Precipitation: one component is “crashed out” of solution z Experiment #1 involves precipitation Used to back-calculate concentration of [Al 3+ ] from mass of Aluminum Oxinate (Alq 3 ) 3 Experiment 1 Experiment 1 : Precipitating Agent : Precipitating Agent z Use of an organic precipitating agent 8-hydroxyquinolinate (Ox ) z Ox ("Oxinate") is used to precipitate Al 3+ + H + N OH N O - 8-hydroxy- quinoline (OxH) 8-hydroxy- quinolinate (Ox )
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lecture 1 - CHEM 6BL Experiment 1: Gravimetry Dr. Sandrine...

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