A repetition of experiment I. An analysis of the oxide after decolorization of the permanganate gave a ratio of manganese to available oxygen of
1.022 : 1.000
Experiment III
The conditions are the same as in the preceding experiments except that twice the amount of permanganate calculated for the conversion of the oxide into manganese dioxide was added.
An analysis of the residue after decolorization gave a ratio of manganese to available oxygen of
0.994 : 1.000
Experiment IV
A repetition of experiment III. An analysis of the residue gave a ratio of manganese to available oxygen of
0.995 : 1.000
Experiment V