recrystallization and melting point
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Recrystallization and Melting Point. January 19. Purification and Characterization. Purification: separation of target compound from impurities Characterization Identity: Do I have what I think I have? Purity: How pure is the compound?. Recrystallization. Purification for solids

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Presentation Transcript
purification and characterization
Purification and Characterization
  • Purification: separation of target compound from impurities
  • Characterization
    • Identity: Do I have what I think I have?
    • Purity: How pure is the compound?
recrystallization
Recrystallization
  • Purification for solids
  • Useful for
    • Large samples
    • Final purification step
  • Based on differential solubility
practical aspects
Practical Aspects

Impure Solid  Dissolve Recrystallize Filter

www.whfreeman.com/mohrig3e then Movies and Spectra  Williamson Movies  5.3 Recrystallization (macroscale)

(Also look at others, such as Drying Organic Liquids and Melting Points)

recrystallization theory
Recrystallization: Theory
  • IMF in solids
  • Temperature dependence
  • Equilibrium process in slow crystal formation
important points
Important Points
  • Choice of solvent
  • Mixed solvents
  • Maintaining hot solvent
    • Safety when boiling
  • Hot filtration
  • Inducing crystallization
  • Washing crystals
  • Too much/too little solvent
  • Oiling out
melting point
Melting Point
  • Physical property to characterize substance
    • Identity
    • purity

capillary

Melt-temp

theory and application
Theory and Application
  • Theory
    • Pure crystals and impure crystals
    • Intermolecular Forces
    • Lattice energy
  • Application
    • Depressed MP
    • Broad MP
    • Mixed MP

Eutectic mixture

extraction lab
Extraction Lab

Question: How does the identity of an impurity affect the choice of extraction solvent?

Techniques: Extraction, drying, evaporation, melting point

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