Application to the S IV -Hydrogen Peroxide Reaction

An analogous examination of mass transport limitations can be carried out for the aqueous-phase reaction of S(IV) with H2Q2 with a reaction rate given by 

Let us first examine the points for H202. Both the H202 solubility and the effective first-order rate constant, fci,H2o2, depend only weakly on pH, resulting in tightly clustered points. The reason for the pH independence of i.h2o2 is, as we saw in Chapter 7, the nearly opposite pH dependences of fcH2o2 and //, [V that cancel each other in (12.97). 

FIGURE 12.11 Examination of mass transport limitation in the S(IV)-H202 reaction. Mass transport limitation is absent for points below and to the left of the indicated bounds (Schwartz 1988). 

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