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Consider the Following Mechanism for the Oxidation of Bromide Ions

question 49

Multiple Choice

Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H+ + H2O2 Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H<sup>+</sup> + H<sub>2</sub>O<sub>2</sub>   H<sub>2</sub>O<sup>+</sup>-OH (rapid equilibrium)  H<sub>2</sub>O<sup>+</sup>-OH + Br<sup>-</sup> <font face= symbol ></font> HOBr + H<sub>2</sub>O (slow)  HOBr + H<sup>+</sup> + Br<sup>-</sup> <font face= symbol ></font> Br<sub>2</sub> + H<sub>2</sub>O (fast)  Which of the following rate laws is consistent with the mechanism? A)  Rate = k[H<sub>2</sub>O<sub>2</sub>][H<sup>+</sup>]<sup>2</sup>[Br<sup>-</sup>] B)  Rate = k [H<sub>2</sub>O<sup>+</sup>-OH][Br<sup>-</sup>] C)  Rate = k[H<sub>2</sub>O<sub>2</sub>][H<sup>+</sup>][Br<sup>-</sup>] D)  Rate = k[HOBr][H<sup>+</sup>][Br<sup>-</sup>][H<sub>2</sub>O<sub>2</sub>] E)  Rate = k[Br<sup>-</sup>] H2O+-OH (rapid equilibrium)
H2O+-OH + Br- HOBr + H2O (slow)
HOBr + H+ + Br- Br2 + H2O (fast)
Which of the following rate laws is consistent with the mechanism?


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