Abstract
The kinetics of the reaction H4I06" =s=^ ," + 2H20 (where kD (sec."1) and (sec."1) kH.
are the over-all first-order rate constants for dehydration and hydration) have been studied by the temperature-jump method. The rate constants at 20° and ionic strength 0.1 M are: 1cD = (5.6 ± 0.6) X 10® sec."1 and /cH = (1.9 ± 0.2) X 102 sec."1. The reaction was studied in a pH range of 3.4 to 5.0. No catalytic effect of hydrogen ion was detected within experimental error. A two-step mechanism involving proton transfer via hydrogen bonding is postulated to explain the observed data.