Die Reduktionsgeschwindigkeit der Chlors�ure und Broms�ure

Kinetics of the bromate–bromide reaction at high bromide concentrations

“…This work confirms the term proportional to [Br − ] 2 in the rate law of the bromate-bromide reaction previously proposed [3,4,13]. It becomes important only at high bromide concentrations and, consequently, can be observed only at high ionic strengths.…”

“…The general model we have proposed [17] for this family of reaction, based on the ideas of Bray [18], Skrabal and Schreiner [4], and Sigalla [6], explains the k 2 term in rate law (3 …”

“…• C. One stoppedflow syringe contained a mixture of NaBrO 3 , HClO 4 , and NaClO 4 and the other a mixture of NaBr, HClO 4 , and NaClO 4 . The concentrations of NaClO 4 in the two mixtures were such that their ionic strengths were similar * and that the ionic strength after mixing was exactly 1 or 2 M. Most of the experiments were performed * Experiments with [Br − ] = 3.77 M and no NaClO 4 ([Br − ] = 1.88 M and I = 2 M after mixing) gave abnormal results and were discarded.…”

“…but a second term proportional to [Br − ] 2 has been suggested [3,4]. [14] called this work in question, reinvestigated the kinetics of reaction (1) and con- cluded that it follows the rate law (2) without additional terms.…”

“…[14] called this work in question, reinvestigated the kinetics of reaction (1) and con- cluded that it follows the rate law (2) without additional terms. However, most of their experiments were performed with bromide concentrations lower than 0.1 M, too low to see the term proportional to [Br − ] 2 [3,4,13], and we have decided to study once more this venerable reaction using higher bromide concentrations.…”