AUTOCATALYSIS: A MODIFIED BELOUSOV-ZHABOTINSKY REACTION
ABSTRACT
Some chemical reactions are able to oscillate in time and in space, that is, a periodic change (i.e. color changes, gas emissions) is observed. In this experiment, an oscillating chemical reaction Belousov-Zhabotinsky was investigated. This chemical reaction, which was discovered in 1951, oscillates with a clock-like precision as it approaches equilibrium. The original Belousov reaction is made up of the oxidation of malonic acid by bromate ions in a medium of sulfuric acid catalyzed by cerium. In this analysis, a modified version was performed by oxidizing citric acid by bromate in acidic medium and catalyzed by manganese. The oxidized manganese ion Ce3+ is reddish in color and the reduced state Mn2+ is clear. Addition of Mn2+ to the citric acid-bromate solution resulted to an initial observation of few quick color changes from clear to red and back with an interval of about 7 seconds per oscillation for......
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