Kinetics of Iodous Acid Disproportionation
ABSTRACT The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO2H → IO3− + IOH + H+ separately. Hg(II) was used previously to suppress the autocatalytic pathway, but this method presents difficulties discussed in this work. A more effecti...
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| Published in | International journal of chemical kinetics Vol. 45; no. 8; pp. 525 - 530 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English French German |
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Blackwell Publishing Ltd
01.08.2013
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| Abstract | ABSTRACT
The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO2H → IO3− + IOH + H+ separately. Hg(II) was used previously to suppress the autocatalytic pathway, but this method presents difficulties discussed in this work. A more effective method is the use of crotonic acid, an effective IOH scavenger. It suppresses side reactions, and a purely second‐order rate law is obtained. The rate constant decreases from 5 to 0.2 M−1 s−1 when the sulfuric acid concentration increases from 0.08 to 0.60 M. The observed decrease could be explained if IO2− reacts faster than IO2H. This may have consequences for the mechanism of the oscillating Bray–Liebhafsky reaction. |
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| AbstractList | ABSTRACT
The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO
2
H → IO
3
−
+ IOH + H
+
separately. Hg(II) was used previously to suppress the autocatalytic pathway, but this method presents difficulties discussed in this work. A more effective method is the use of crotonic acid, an effective IOH scavenger. It suppresses side reactions, and a purely second‐order rate law is obtained. The rate constant decreases from 5 to 0.2 M
−1
s
−1
when the sulfuric acid concentration increases from 0.08 to 0.60 M. The observed decrease could be explained if IO
2
−
reacts faster than IO
2
H. This may have consequences for the mechanism of the oscillating Bray–Liebhafsky reaction. The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO2H [arrow right] IO3- + IOH + H+ separately. Hg(II) was used previously to suppress the autocatalytic pathway, but this method presents difficulties discussed in this work. A more effective method is the use of crotonic acid, an effective IOH scavenger. It suppresses side reactions, and a purely second-order rate law is obtained. The rate constant decreases from 5 to 0.2 M-1 s-1 when the sulfuric acid concentration increases from 0.08 to 0.60 M. The observed decrease could be explained if IO2- reacts faster than IO2H. This may have consequences for the mechanism of the oscillating Bray-Liebhafsky reaction. [PUBLICATION ABSTRACT] ABSTRACT The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO2H → IO3− + IOH + H+ separately. Hg(II) was used previously to suppress the autocatalytic pathway, but this method presents difficulties discussed in this work. A more effective method is the use of crotonic acid, an effective IOH scavenger. It suppresses side reactions, and a purely second‐order rate law is obtained. The rate constant decreases from 5 to 0.2 M−1 s−1 when the sulfuric acid concentration increases from 0.08 to 0.60 M. The observed decrease could be explained if IO2− reacts faster than IO2H. This may have consequences for the mechanism of the oscillating Bray–Liebhafsky reaction. |
| Author | Schmitz, Guy Furrow, Stanley D. |
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| Cites_doi | 10.2298/JSC0205347M 10.1039/ft9949001875 10.1007/s11144-009-0003-7 10.1039/c1cp00006c 10.1002/kin.20516 10.1039/b927432d 10.1021/j100226a027 10.1002/kin.550140811 10.1021/jp0138779 10.1002/kin.20344 10.1021/j100292a031 10.1007/s11144-006-0080-9 10.1021/ed082p1091 |
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| Snippet | ABSTRACT
The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO2H → IO3− + IOH + H+ separately.... ABSTRACT The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO 2 H → IO 3 − + IOH + H +... The iodous acid disproportionation is autocatalytic, and it is not easy to measure the rate constant of the step 2IO2H [arrow right] IO3- + IOH + H+... |
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| Title | Kinetics of Iodous Acid Disproportionation |
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