The reaction between manganese dioxide and potassium permanganate

by Arthur John Hopkins

Acid neutralized = 4.51 c.c. = 64.60 percent.

II. The flask contained brown oxide 150 m.g. N/10 nitric acid 6.98 c.c. and was heated for 50 minutes in the water-bath.

Acid neutralized = 3.09 c.c. = 44.20 percent.

III. The flask contained brown oxide 150 m.g. N/10 nitric acid 7.46 c.c. and was heated for fifty minutes in the water-bath.

Acid neutralized = 3.16 c.c. = 42.30 percent.

IV. The flask contained brown oxide 150 m.g. N/10 nitric acid 7.46 c.c. and was heated for 15 minutes in the water-bath.

Acid neutralized 2.76 c.c. = 37.0 percent

V. The flask contained brown oxide 150 m.g. potassium permanganate 20 c.c. = 112.48 m.g. N/10 nitric acid 6.98 c.c. (= 2 molecules for each molecule of KMnO₄) and was heated for three hours in the water-bath.

Acid neutralized = 0.35 c.c. = 5.0 percent.

VI. Repetition of No. V.