The Amount of Nitric Acid neutralized.
A few experiments were made to determine how much nitric acid is neutralized under the conditions which prevailed in the foregoing experiments.
I. The flask contained brown oxide 150 m.g. N/10 nitric acid 6.98 c.c. and was heated for three hours in the water-bath.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 percentV. 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.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. VIIAcid neutralized = 4.0 percentIX. 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.Acid neutralized = 100.00 percent.
I. The flask contained brown oxide 150 m.g. N/10 nitric acid 6.98 c.c. and was heated for three hours in the water-bath.
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.
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.
Acid neutralized = 100.00 percent.
No definite conclusions can be drawn from these neutralization experiments since it is well known that manganese oxides prepared as were those used in these experiments always contain some, though probably not a constant quantity of alkali. It is stated by Bemmelen[9]that manganese dioxide decomposed the salts of the alkalies with liberation of acid.