A Modified Recipe and Variations for the Briggs-Rauscher Oscillating Reaction

A modified recipe for the Briggs-Rauscher oscillating reaction is suggested. The modified recipe, [H2SO4] = 0.10 M, [KIO3] = 0.020 M, [NaIO4] = 0.00062 M, [malonic acid] = 0.050 M, [MnSO4] = 0.0067 M, [H2O2] = 1.0 M with 0.01% starch, turns blue almost immediately, then oscillations start with two "slow" (similar to 25 s) cycles, then settle into regular approximately 12-15 s cycles. Oscillations end with a clear solution, avoiding cleanup of solid iodine resulting from the "standard" recipe, so that only neutralization of excess acid is needed before disposal. Effects of concentration variations are presented.