CHEM 205 lecture 8

• Methods of analysis


  • Destructive methods
  • Non-destructive methods
  • Separation method
• Destructive methods


  • Mass spectrometry: measuring mass-to-charge ratio of one or more molecules
  • Selective reaction: find composition of sample via combustion analysis or titration
• Non-destructive methods


  • Ph measurement: concentration of acid/ base in solution
  • Spectrophotometry: concentration of coloured species in solution
• Separation method


  • Chromatography: separate substances by firstly getting dissolved in a substance called mobile phase, then the second phase called stationary phase
  • Sublimation: converting substance from solid to gas without becoming liquid
  • Distillation: separating liquid mixture through selective evaporation and condensation
  • Filtration: separating separate solid from liquid