Abstract
The kinetics of the oxidation of iodide by peroxyacetic acid (PAA) in aqueous media in the presence and absence of the heptamolybdate has been studied by a high time resolution spectrophotometric stopped-flow method. The time-dependent concentration of the liberated iodine was monitored by the change in absorbance at 352 nm. The effect of ammonium heptamolybdate as well as pH on the rate of the reaction was also studied and it was found that the rate of the reaction is independent of pH and molybdate concentration under the examined conditions. The results obtained show that the rate law of the reaction can be expressed as rate=
k[PAA][I
−] with a value of
k=4.22×10
2 (mole/l)
−1 s
−1 at pH 3.5–5.4 and 25
°C.
The kinetics of the oxidation of iodide by peroxyacetic acid (PAA) in aqueous media in the presence and absence of the heptamolybdate has been studied by a high time resolution spectrophotometric stopped-flow method. The time-dependent concentration of the liberated iodine was monitored by the change in absorbance at 352 nm. The rate law can be expressed as rate=
k[PAA][I
−] with a value of
k=4.22×10
2 (mole/L)
−1 s
−1 at pH 3.5–5.4 and 25
°C.