Dissolution kinetics of colloidal manganese dioxide in aqueous hydrochloric acid at 298 K

Md Aminul Islam, M. Muhibur Rahman

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The dissolution kinetics of colloidal MnO2 in aqueous hydrochloric acid is studied at 298 K by spectrophotometric methods. The decay profile of MnO2 monitored by measuring absorbance due to MnO2 at 390 nm was exponential. As the hydrochloric acid concentration was increased from 1.26 to 5.03 M, the dissolution rate of MnO2 to Mn(II) species decreased. The reaction followed fractional order kinetics with respect both to MnO2 and HCl concentrations. The average oxidation state approached a value of +2 indicating that HCl reduced Mn-species to Mn(II) species. Mechanism based on the observed kinetics has been proposed and discussed.

Original languageEnglish
Pages (from-to)706-709
Number of pages4
JournalRussian Journal of Physical Chemistry A
Volume89
Issue number4
DOIs
StatePublished - Apr 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 Pleiades Publishing, Ltd.

Keywords

  • colloid
  • dissolution
  • hydrochloric acid
  • kinetics
  • manganese dioxide

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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