The reaction between manganese dioxide and potassium permanganate

by Arthur John Hopkins

Acid neutralized = 0.44 c.c. = 6.3 percent.

VII. The flask contained brown oxide 150 m.g. potassium permanganate the same as in numbers V and VI and was heated for 15 minutes in the water-bath.

Acid neutralized = 5.2 percent.

VIII. Repetition of No. VII

Acid neutralized = 4.0 percent

IX. The flask contained black oxide 150 m.g. N/10 nitric acid 14.93 c.c. and was heated for two and one fourth hours in the water-bath.

Acid neutralized = 4.87 c.c. = 32.46 percent.

X. Repetition of No. IX.

Acid neutralized = 38.10 percent.

XI. The flask contained black oxide 150 m.g. potassium permanganate 20 c.c. = 177.71 m.g., N/10 nitric acid 22.39 c.c. (= 2 molecules for each molecule of KMnO₄) and was heated four and one half hours in the water bath.