The kinetics of the hydrolysis of the dichromate ion. VI. Environmental influences on the acid-catalyzed reaction

Ruth Koren, Berta Perlmutter-Hayman

Research output: Contribution to journalArticlepeer-review

Abstract

The influence of electrolytes, of dioxane, and of temperature on the rate of the acid-catalyzed hydrolysis of the dichromate ion has been investigated by the T-jump method. Where comparison is possible, the results are in excellent agreement with those reported earlier. The effect of sodium salts shows only a slight deviation from "classical" behavior. The apparent energy of activation is 8.92 ± 0.34 and 8.26 ± 0.44 kcal mol-1 at an ionic strength of 0.05 and 0.20, respectively. The influence of dioxane is less pronounced than would be expected from its influence on the dielectric constant. Tetramethylammonium chloride has a stronger decelerating influence than the sodium salts, at the same time, however, decreasing the apparent energy of activation, especially when temperatures up to 29° are considered. The influence of water structure is discussed as a possible explanation for the effects of dioxane and of tetramethylammonium chloride.

Original languageEnglish
Pages (from-to)582-586
Number of pages5
JournalJournal of Physical Chemistry
Volume76
Issue number4
DOIs
StatePublished - 1972
Externally publishedYes

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