Chemical selectivities disguised by mass diffusion. V. Mixing‐disguised azo coupling reactions. 6th communication on the selectivity of chemical processes

The results of this study show that, for given initial and boundary conditions, four parameters are sufficient to describe the final product distribution of azo coupling reactions influenced by mixing. This is in agreement with the prediction of the mixing‐reaction model developed previously [4] [5]. In order to explain the pH‐dependence of the measured mixing‐disguised product distribution, it is necessary to assume that a selectivity‐determining, local pH‐gradient exists even though the solution is macroscopically buffered.