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Chapter 12: Gravimetric Methods of Analysis

Chapter 12: Gravimetric Methods of Analysis. CHE 321: Quantitative Chemical Analysis Dr. Jerome Williams, Ph.D. Saint Leo University. Overview. Gravimetric Analysis Precipitating Agents Applications of Gravimetric Methods. Gravimetric Analysis.

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Chapter 12: Gravimetric Methods of Analysis

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  1. Chapter 12: Gravimetric Methods of Analysis CHE 321: Quantitative Chemical Analysis Dr. Jerome Williams, Ph.D. Saint Leo University

  2. Overview • Gravimetric Analysis • Precipitating Agents • Applications of Gravimetric Methods

  3. Gravimetric Analysis • Formation and growth of crystals are very important in analytical chemistry and other areas of science.

  4. Gravimetric Analysis • Gravimetric methods are based on determining mass of a pure compound to which the analyte is chemically related. • Types of analysis • Precipitation gravimetry Volatilization gravimetry • Gravimetric Titrimetry Electrogravimetry • Atomic Mass Spectrometry

  5. Gravimetric Analysis • Precipitation gravimetry: • A precipitating agent should react specifically or at least selectively with the analyte. • Characteristics of ideal precipitating agent • 1. Easily filtered & washed free of contaminants • 2. Low solubility to minimize loss of sample • 3. Unreactive with atmosphere. • 4. Known chemical composition after dried or ignited

  6. Gravimetric Analysis • Particle Size & Filterability of Precipitates: • Larger particles generally more desirable. • Factors that determine Particle Size: • 1. Colloidal vs. Crystalline suspensions • 2. Relative supersaturation • 3. Mechanism: Nucleation & Particle Growth

  7. Figure 12-5 p289

  8. Figure 12-6 p290

  9. Table 12-1 p290

  10. Table 12-2 p294

  11. Table 12-3 p295

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  21. Table 12-4 p297

  22. Figure 12-8 p298

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