Posible three-step mechanism decribing the reaction of hydrogen peroxide with io

Question

Posible three-step mechanism decribing the reaction of hydrogen peroxide with iodide ion in an acidic solution

Mechanistic Interpretation: Given below is a possible three-step mechanism describing the reaction of hydrogen peroxide with iodide ion in an acidic solution. Step I: (slow) H_2O_2(aq) + I^+(aq) rightarrow OH^-(aq) + HOI(aq) step 2: (very fast) OH^-(aq) + H^+(aq) rightarrow H_2O(aq) step 3: HOI(aq) H^+(aq) + I^+ rightarrow I_2(aq) + H_2O(aq) Assuming that the above reaction mechanism is correct, write the expected rate law expression. Is your experimental data consistent with the proposed mechanism? Explain your answer.

Explanation / Answer

The rat of the reaction depends on the slowest step, so the rate low for the reaction given will be

rate = K [H2O2(aq)] [I-(aq)]

This rate law explains the dependency of rate on concentration of hydrogen peroxide and iodine, while iodine acts as a catalyst in the reaction. The experimental data should support the above said.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---