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Lecture 1 Gravimetry

Lecture 1 Gravimetry - CHEM 6BL Experiment 1 Gravimetry Dr...

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CHEM 6BL Experiment 1: Gravimetry Dr. Sandrine Berniolles 1 1 Experiment 1: Gravimetric Analysis circle6 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) circle6 Quantitative Analysis: Gravimetry is the measurement of masses or densities 2 Gravimetric Analysis Methods circle6 Two primary ways of gravimetric analysis Combustion: collect the resulting residues Precipitation: one component is “crashed out” of solution circle6 Experiment #1 involves precipitation Used to back-calculate concentration of [Al 3+ ] from mass of Aluminum Oxinate (Alq 3 ) 3 Experiment 1 : Precipitating Agent circle6 Use of an organic precipitating agent 8-hydroxyquinolinate (Ox ) circle6 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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CHEM 6BL Experiment 1: Gravimetry Dr. Sandrine Berniolles
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