Briggs-Rauscher reaction
From Wikipedia, the free encyclopedia
The Briggs-Rauscher reaction is an example of a clock reaction which causes a visible oscillation in colour over a period of serval minutes. The reation is typically started by a mixture of clear, colourless solutions which then osciallates between pale orange, clear, and black, making an excellent visual demonstration for chemistry courses.
The reaction:
takes place in two stages which occur at different rates determined by the concentration of iodine in the solution.
The reduction of iodine can occur by a radical process which is turned on when I- concentration is low, or by a nonradical process when the I- concentration is high. Both processes reduce iodate to hypoiodous acid. The radical process forms hypoiodous acid at a much faster rate than the nonradical process.
[edit] Links
- Time Lapse images of reaction
- CCA Demonstration Videos
- About.com reference from which this equation was presumably taken?
