Suspecting that this great diminution was owing to the absorption of some of the nitrogene formed, by the charcoal of the pyrophorus, I carefully made a quantity of pyrophorus; employing more than two thirds of alumn, to one third of sugar.
To rather more than half of a cubic inch of this, two cubic inches of nitrous gas, which contained about ¹/₄₀ nitrogene, were admitted. After the combustion, the gas remaining, apparently filled a space equal to 1,2 cubic inches; but, as on account of the burnt pyrophyrus in the jar, it was impossible to ascertain the volume with nicety, it was carefully and wholly transferred into another jar. It filled a space equal to 1,15 cubic inches nearly.
When water was admitted to this gas no absorption took place. It underwent no diminution with nitrous gas, and a taper plunged into it was instantly extinguished. We may consequently conclude that it was nitrogene.
Now 2 cubic inches of nitrous gas weigh,686 grains, and 1,1 of nitrogene—,05, the quantity previously contained in the gas = to 1,05, 3,19. Hence,686 of nitrous gas would be composed of,367 oxygene, and ,319 nitrogene; and 100 grains would contain 53,4 oxygene, and 46,6 nitrogene.
IV. Additional observations on the combustion of bodies in Nitrous Gas,
and on its Composition.
Though phosphorus may be fused, and even sublimed, in nitrous gas, without producing the slightest luminous appearance,[103] yet when it is introduced into it in a state of active inflammation, it burns with almost as much vividness as in oxygene.[104] Hence it is evident, that at the heat of ignition, phosphorus is capable of attracting the oxygene from the nitrogene of nitrous gas.
I attempted to analise nitrous gas, by introducing into a known quantity of it, confined by mercury, phosphorus, in a vessel containing a minute quantity of oxygene.[105] The phosphorus was inflamed with an ignited iron wire, by which, at the moment of the combustion, the vessel containing it was raised from the mercury into the nitrous gas. But after making in this way, five of six unsuccessful experiments, I desisted. When the communication between the vessels was made before the oxygene was nearly combined with the phosphorus, nitrous acid was formed, which instantly destroyed the combustion; when, on the contrary, the phosphorus was suffered to consume almost the whole of the oxygene, it was not sufficiently ignited when introduced, to decompose the nitrous gas.
In one experiment, indeed, the phosphorus burnt for a moment in the nitrous gas; the diminution however was slight, and not more than ¼ of it was decomposed.
Sulphur, introduced in a state of vivid inflammation, into nitrous gas, was instantly extinguished.
I passed a strong electric shock through equal parts of hydrogene and nitrous gas, confined by mercury in a detonating tube; but no inflammation, or perceptible diminution, was produced.