Kinetics- Potentiometry With The Briggs-Rauscher Reaction

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 are observed by audience
• 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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