Potentiometry

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Author:
skinner.cindy
ID:
176759
Filename:
Potentiometry
Updated:
2012-10-16 11:51:09
Tags:
SAIT instrumentation INST390
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Description:
Applied Instrumentation Potentiometry review
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  1. What is Brian's Equation for cell potentials?
    E cell = E cathode - E anode
  2. EMF
    Electromotive Force
  3. SHE
    Standard Hydrogen Electrode
  4. SCE
    Saturated Calomel Electrode
  5. Calomel (formula)
    Hg2Cl2
  6. SCE electrodes aren't good above __ oC
    60
  7. Which responds faster, and SCE or Ag/AgCl electrode?
    Ag/AgCl
  8. Electrode of the first kind
    A single reaction, the electrode measures its own metal
  9. Electrodes of the Second Kind
    • Electrode forms a precipitate with an anion a and therefore responds to the anion's concentration.
    • Example: Ag/AgCl electrode (Ag senses [Cl])
  10. Can inert redox electrodes measure the absolute concentration of an analyte?
    No, they just give you the ratio (good for titrations)
  11. Crystal
    Atoms arranged in a repeating 3-D structure
  12. ORP
    • Oxidation Reduction Potential
    • (a pH meter mode that gives you mV readings)
  13. What part of the pH calibration equation changes with temperature?
    The slope (it's only -0.0592 at 25 oC)
  14. What kind of crystal is a fluoride ISE?
    • A single crystal
    • LaF3 doped with Eu2+
  15. TISAB
    (give two examples)
    • Total Ion Strength Adjustment Buffer
    • NaCl
    • CaCl2
  16. Give an example of a mixed crystal electrode
    BaSO4

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