Potentiometry with the Briggs-Rauscher Reaction
Description: The potentiometry of the oscillating reaction is determined using a Platinum wire and Ag/AgCl electrode. The periods are about 15 seconds in length, and the potential varies by about 60 mV. The oscillating is monitored on a computer. The reaction lasts about 5 minutes.
Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers
Year: 1985 Vol: 2 Page: 248
Keywords: Briggs-Rauscher, Potentiometry, Electrode, S.C.E.
Rating: 
Hazard: Medium
- Acute toxicity hazard – oral, inhalation, dermal
- Aquatic toxicity hazard
- Specific organ toxicity – respiratory system, thyroid
- Electric shock hazard
- Skin corrosion hazard
- Oxidizer
- Carcinogenicity hazard
Effectiveness: Good
- Some connection from demo to course material
- Time to results is medium
- Mild effects are seen by audience
- Counterintuitive effects
- Secondary effects
- Demo is observable with guidance
- Moderate reliability
Difficulty: High
- Some coordinated or concerted manipulations
- Intermediate steps to results
- Experiments in which data recording and display are necessary
- Use of scientific equipment
- Prior practice recommended
Safety Precautions:
- Eye protection required
- Gloves required
- Use of UL approved three-prong plug and outlet
- Absorbent material on hand
- Sodium bicarbonate on hand
- Perform in a well-ventilated area
- Avoid exposure to mists, droplets, and vapors
- Prevent release of reagents to the environment
Class: Potentiometry, Redox Reactions, Kinetics
Division: Analytical Chemistry, Physical Chemistry
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