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Methylene Blue - Ascorbic Acid: An Undergraduate Experiment in Kinetics

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T. Snehalatha , K. C. Rajanna and P. K. Saiprakash

Department of Chemistry, Osmania University, Hyderabad - 500 007, India

J. Chem. Educ., 1997, 74 (2), p 228

DOI: 10.1021/ed074p228

Publication Date (Web): February 1, 1997

Section:

History, Education, and Documentation

Abstract

Clock reaction experiments with methylene blue (MB) and L-ascorbic acid (H₂ A) were designed in aqueous sulfuric and hydrochloric acid media with a view to demonstrate and explain the concepts in chemical kinetics such as order of the reaction, effect of ionic strength, dielectric constant and temperature. On the basis of the obtained results, a plausible mechanism for the reduction of MB by H₂ A has been proposed.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Demonstrations

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Kinetics

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This article has been cited by 7 ACS Journal articles (5 most recent appear below).

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Ultratrace Kinetic Measurements of the Reduction of Methylene Blue
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  The kinetics of methylene blue reduction by ascorbic acid in acetonitrile was investigated by cavity ring-down spectroscopy. Because of our high sensitivity we were able to use very low concentrations (1−10 nM) of the dye. Under these conditions, we ...
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