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The chlorate-iodine-nitrous acid clock reaction.

Sant'Anna RT, Faria RB - PLoS ONE (2014)

Bottom Line: The induction period of this new clock reaction decreases when the initial concentrations of chlorate, nitrous acid and perchloric acid increase, but it is independent on the initial iodine concentration.The proposed mechanism is based on the LLKE autocatalytic mechanism for the chlorite-iodide reaction and the initial reaction between chlorate and nitrous acid to produce nitrate and chlorite.This new clock reaction opens the possibility for a new family of oscillating reactions containing chlorate or nitrous acid, which in both cases has not been observed until now.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.

ABSTRACT
A new clock reaction based on chlorate, iodine and nitrous acid is presented. The induction period of this new clock reaction decreases when the initial concentrations of chlorate, nitrous acid and perchloric acid increase, but it is independent on the initial iodine concentration. The proposed mechanism is based on the LLKE autocatalytic mechanism for the chlorite-iodide reaction and the initial reaction between chlorate and nitrous acid to produce nitrate and chlorite. This new clock reaction opens the possibility for a new family of oscillating reactions containing chlorate or nitrous acid, which in both cases has not been observed until now.

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Effect of iodine concentration (indicated in the figure – mol L−1) in the clock time.Other initial concentrations: [HClO4] = 0.948 mol L−1; [NaClO3] = 0.0251 mol L−1; [HNO2] = 1.15×10−3 mol L−1. Experimental (symbols); simulation (continuous lines). Experimental data point were measured at every 2 s.
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pone-0109899-g005: Effect of iodine concentration (indicated in the figure – mol L−1) in the clock time.Other initial concentrations: [HClO4] = 0.948 mol L−1; [NaClO3] = 0.0251 mol L−1; [HNO2] = 1.15×10−3 mol L−1. Experimental (symbols); simulation (continuous lines). Experimental data point were measured at every 2 s.

Mentions: Figures 2, 3, and 4 show that the induction period of this chlorate-iodine-nitrous acid clock reaction decreases as the initial concentrations of chlorate, nitrous acid, and perchloric acid are increased. However, the induction period does not change when the initial iodine concentration is modified (Figure 5).


The chlorate-iodine-nitrous acid clock reaction.

Sant'Anna RT, Faria RB - PLoS ONE (2014)

Effect of iodine concentration (indicated in the figure – mol L−1) in the clock time.Other initial concentrations: [HClO4] = 0.948 mol L−1; [NaClO3] = 0.0251 mol L−1; [HNO2] = 1.15×10−3 mol L−1. Experimental (symbols); simulation (continuous lines). Experimental data point were measured at every 2 s.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4196969&req=5

pone-0109899-g005: Effect of iodine concentration (indicated in the figure – mol L−1) in the clock time.Other initial concentrations: [HClO4] = 0.948 mol L−1; [NaClO3] = 0.0251 mol L−1; [HNO2] = 1.15×10−3 mol L−1. Experimental (symbols); simulation (continuous lines). Experimental data point were measured at every 2 s.
Mentions: Figures 2, 3, and 4 show that the induction period of this chlorate-iodine-nitrous acid clock reaction decreases as the initial concentrations of chlorate, nitrous acid, and perchloric acid are increased. However, the induction period does not change when the initial iodine concentration is modified (Figure 5).

Bottom Line: The induction period of this new clock reaction decreases when the initial concentrations of chlorate, nitrous acid and perchloric acid increase, but it is independent on the initial iodine concentration.The proposed mechanism is based on the LLKE autocatalytic mechanism for the chlorite-iodide reaction and the initial reaction between chlorate and nitrous acid to produce nitrate and chlorite.This new clock reaction opens the possibility for a new family of oscillating reactions containing chlorate or nitrous acid, which in both cases has not been observed until now.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.

ABSTRACT
A new clock reaction based on chlorate, iodine and nitrous acid is presented. The induction period of this new clock reaction decreases when the initial concentrations of chlorate, nitrous acid and perchloric acid increase, but it is independent on the initial iodine concentration. The proposed mechanism is based on the LLKE autocatalytic mechanism for the chlorite-iodide reaction and the initial reaction between chlorate and nitrous acid to produce nitrate and chlorite. This new clock reaction opens the possibility for a new family of oscillating reactions containing chlorate or nitrous acid, which in both cases has not been observed until now.

Show MeSH