Figure 5.19 illustrates the application of Eq. (PPP) to the reaction of 03 with I~ in solution. In this case, reaction is faster than the diffusion solubility term so the latter can be neglected. In addition, gas-phase diffusion is fast and can be neglected. Hence Eq. (PPP) reduces to Eq. (QQ). The rate constant in this case is a pseudo-first-order rate constant, k = where k'
is the second-order rate constant for the solution-phase
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