Chapter 20, Problem 84IAE

Interpretation Introduction

Interpretation:

Whether the following mechanism is consistent with the rate law of iodine-hypochlorite that is ${\text{Rate=k[OCl}}^{\text{-}}{\text{]}}^{\text{1}}{{\text{[I}}^{\text{-}}\text{]}}^{\text{1}}{{\text{[OH}}^{-}\text{]}}^{\text{-1}}$ should be determined.

$\begin{array}{l}{\text{Fast OCl}}^{-}+{\text{H}}_{\text{2}}\text{O}\underset{k_{-1}}{\stackrel{k_1}{\rightleftharpoons }}{\text{HOCl+OH}}^{\text{-}}\\ {\text{Slow I}}^{\text{-}}\text{+HOCl}\stackrel{{\text{k}}_{\text{2}}}{\to }{\text{HOI+Cl}}^{\text{-}}\\ {\text{Fast HOI+OH}}^{\text{-}}\underset{k_{-3}}{\stackrel{k_3}{\rightleftharpoons }}{\text{H}}_{\text{2}}{\text{O+OI}}^{\text{-}}\end{array}$

Concept introduction:

• In the mechanism of any reaction, the slow step is the rate determining step.
• An intermediate can never exist in the rate law.