The Reaction between
Manganese Dioxide
and
Potassium Permanganate.

Dissertation

presented for the degree of
Doctor of Philosophy
to the Board of University Studies
of the Johns Hopkins University

by
Arthur John Hopkins.
1893.

Acknowledgment——

The work recorded in this paper is the result of a suggestion given by Professor H. N. Morse. It has received his careful attention throughout its course. For his instruction and exact criticism, I wish to offer my acknowledgment and thanks. I wish also to express to Professor Ira Remson my appreciation of his interest and instruction and to offer to Dr. J. S. Ames my thanks for his instruction in Physics——

Table of Contents.

 Page.
I Introduction [ 1]
II Description of Apparatus [ 3]
III Action of Manganese Dioxide on
Potassium Permanganate in acid solution [ 9]
IV Action of a Black Oxide of Manganese on
Potassium Permanganate [24]
V The Amount of Nitric Acid Neutralized [31]
VI The Stability of Manganese Dioxide [34]
VII The Effect of Varying Quantities of
Manganese Oxide and Potassium Permanganate [39]
VIII The Reduction of Neutral Potassium Permanganate
by Manganese Oxide at Ordinary Temperature [45]
IX Action of Potassium Permanganate upon a
Manganese Oxide Obtained from Manganese
Dioxide by Spontaneous Decomposition [50]
[Conclusion]

Introduction.