Recipe for the Belousov-Zhabotinsky (BZ) oscillating reaction

source: B.Z. Shakhashiri, "Chemical Demonstrations: A Handbook for Teachers" (University of Wisconsin, Wisconsin, 1985), and R.J. Field, "A Reaction Periodic in Time and Space", J. Chem. Ed. 49, 308 (1972). Also see J.A. Pojman, R. Craven, D.C. Leard, J. Chem. Ed. 71, 84 (1994) for a description of a Physical Chemistry Lab experiment.

Prepare a solution with the following concentrations of reactants. The volume should be large enough for the intendended audience to view. The reaction mixture should be stirred constantly with a magnetic stirring bar. These concentrations will give a system that oscillates with a period of about 30 sec and the oscillations will continue for 50 minutes or more. The reactants can be mixed in any order.

Reactant

Concentration, M

Ce(NH4)2 (NO3)5 (catalyst)

0.002

CH2 (COOH)2

0.275

KBrO3

0.0625

H2SO4

1.5

Ferroin (indicator)

0.0006

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