Gravimetric

• Chapter 4 INTRODUCTION


  1. Classical wet chemistry methods

  2. Qualitative: melting point, color, odor

  3. Quantitative: weight, volume
• Instrumental methods


  • Use physical property of the analyte
  • Use of apparatus
  • Includes chromatography, electrophoresis
• Gravimetry


  The determination of an element or species through the measurement of mass of a well-characterized insoluble product of a definite chemical reaction involving that element or species
• Gravimetric Methods of Analysis

  • Based on mass measurements with an analytical balance
  • Yields highly accurate and precise data
• Precipitation Gravimetry


  The analyte is separated from a solution of the sample as a precipitate and is converted into a compound that can be weighed
• Volatilization Gravimetry


  1. Analyte separated from a solution by converting it to gas

  2. The mass of the gas serves as a measure of the analyte concentration
• Electrogavimetry


  The analyte is separated by deposition of an electrode by an electric current
• Gravimetric titrimetry


  The mass of a reagent of known concentration required to react completely with analyte provides information needed to determine the analyte concentration