Potentiometry

What is Brian's Equation for cell potentials?

E cell = E cathode - E anode
EMF

Electromotive Force
SHE

Standard Hydrogen Electrode
SCE

Saturated Calomel Electrode
Calomel (formula)

Hg₂Cl₂
SCE electrodes aren't good above __ ^oC

60
Which responds faster, and SCE or Ag/AgCl electrode?

Ag/AgCl
Electrode of the first kind

A single reaction, the electrode measures its own metal
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])
Can inert redox electrodes measure the absolute concentration of an analyte?

No, they just give you the ratio (good for titrations)
Crystal

Atoms arranged in a repeating 3-D structure
ORP
- Oxidation Reduction Potential
- (a pH meter mode that gives you mV readings)
What part of the pH calibration equation changes with temperature?

The slope (it's only -0.0592 at 25^oC)
What kind of crystal is a fluoride ISE?
- A single crystal
- LaF₃ doped with Eu²⁺
TISAB
(give two examples)
- Total Ion Strength Adjustment Buffer
- NaCl
- CaCl₂
Give an example of a mixed crystal electrode

BaSO₄

Author

skinner.cindy

176759

Card Set

Potentiometry

Description

Applied Instrumentation Potentiometry review

Updated

2012-10-16T15:51:09Z

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