Issue 30, 2011

pH-oscillations in a closed chemical system of CaSO3–H2O2–HCO3

Abstract

Long-lasting large amplitude periodic change of the pH is measured in an aqueous suspension of CaSO3H2O2HCO3 at 2.0–10.0 °C in a closed reactor. The amplitude can be as large as 2 pH units between pH 5 and 7. The observed phenomenon is explained and simulated by taking into account a slow dissolution of CaSO3, which serves as a continuous supply of HSO3 for a H+-producing autocatalytic composite reaction between H2O2 and HSO3. Protonation of HCO3 to form CO2 in a reversible reaction provides for the necessary negative feedback in [H+].

Graphical abstract: pH-oscillations in a closed chemical system of CaSO3–H2O2–HCO3−

Article information

Article type
Communication
Submitted
30 Mar 2011
Accepted
08 Jun 2011
First published
22 Jun 2011

Phys. Chem. Chem. Phys., 2011,13, 13604-13606

pH-oscillations in a closed chemical system of CaSO3H2O2HCO3

G. Rábai, Phys. Chem. Chem. Phys., 2011, 13, 13604 DOI: 10.1039/C1CP20978G

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