B An Oscillating Iodine Clock Briggs-Rauscher Reaction

B An Oscillating Iodine Clock (Briggs-Rauscher Reaction) 

Briggs and Rauscher discovered an oscillating reaction which is identified as an iodine clock. It resembles the iodate-hydrogen peroxide reaction of Bray (1921), and has some of the elements of the reaction of Belousov, see Section III.C. The chemicals involved are  

Malonic acid, CH2(COOH)2 Manganese(II) sulfate, MnS04 Starch. 

Substitution of 2,4-pentanedione for malonic acid results in short lived oscillations, and substitution of cerium as catalyst in place of manganese results in higher frequency oscillations. 

As shown below in modelling this reaction various solutions were considered. For certain values of parameters it is shown that there are three singular solutions, two stable and one unstable as well as limit cycles (multiple solutions). 

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