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Consider the Following Mechanism for the Oxidation of Bromide Ions \to

Question 27

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>  \to  HOBr + H<sub>2</sub>O (slow)  HOBr + H<sup>+</sup> + Br<sup>-</sup>  \to  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- \to HOBr + H2O (slow)
HOBr + H+ + Br- \to Br2 + H2O (fast)
Which of the following rate laws is consistent with the mechanism?


A) Rate = k[H2O2][H+]2[Br-]
B) Rate = k [H2O+-OH][Br-]
C) Rate = k[H2O2][H+][Br-]
D) Rate = k[HOBr][H+][Br-][H2O2]
E) Rate = k[Br-]

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