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Determination of the Equilibrium Constant. Theory. Beer’s Law : Concentration is proportional to Absorbance The reaction: Fe +3 + SCN - [Fe(SCN)] +2 Kc = . Beer’s Law : Concentration is proportional to Absorbance The reaction: Fe +3 + SCN - [Fe(SCN)] +2 K c = .

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Presentation Transcript
theory
Theory
  • Beer’s Law: Concentration is proportional to Absorbance
  • The reaction: Fe+3 + SCN- [Fe(SCN)]+2

Kc =

  • Beer’s Law: Concentration is proportional to Absorbance
  • The reaction: Fe+3 + SCN- [Fe(SCN)]+2
    • Kc =
slide3
Fe(SCN)+2 absorbs light in the blue-green region
    • Set up standard curve with absorbance readings for solutions of known concentration
    • Beer’s Law plot
slide4
Math
  • Determine moles of each reactant species
  • Determine M for each based on total volume of solution
  • ICE
  • Keq =
  • Lab,P. 298
spectrophotometer
Spectrophotometer
  • 3 clean cuvettes, wipes
  • Empty chamber
    • Light source on
    • Power knob: 0%T
  • Water blank
    • 447 nm
    • Clean cuvette with distilled water
    • Light source on
    • T knob: 100% T
slide6
HNO3 blank
    • Set absorbance = to 0
  • Test solutions
  • Zero the machine frequently
  • http://www.chm.davidson.edu/java/spec/spec.html