. Elements of modern chemistry . Fig. 63. NITROGEN DIOXIDE, OR NITRIC OXIDE. 153 NITEOaEN DIOXIDE, OR NITRIC OXIDE. Density compared to air Density compared to hydrogen 15. Molecular weight NO =30. Preparation.—This gas was discovered in 1772 by Hales;it is prepared by decomposing cold, dilute nitric acid by metalliccopper. 3Cu -f 8HN0^ = 3Cu(N0) + 4:W0 + 2N0 Copper. Nitric acid. Cupric nitrate. The copper and water are introduced into a gas-bottle, andordinary nitric acid is added by means of a funnel-tube ; thecopper is immediately attacked and dissolved, forming cupricnitrate (Fig. 64
. Elements of modern chemistry . Fig. 63. NITROGEN DIOXIDE, OR NITRIC OXIDE. 153 NITEOaEN DIOXIDE, OR NITRIC OXIDE. Density compared to air Density compared to hydrogen 15. Molecular weight NO =30. Preparation.—This gas was discovered in 1772 by Hales;it is prepared by decomposing cold, dilute nitric acid by metalliccopper. 3Cu -f 8HN0^ = 3Cu(N0) + 4:W0 + 2N0 Copper. Nitric acid. Cupric nitrate. The copper and water are introduced into a gas-bottle, andordinary nitric acid is added by means of a funnel-tube ; thecopper is immediately attacked and dissolved, forming cupricnitrate (Fig. 64), and at the same time nitric oxide gas is dis-engaged. This gas absorbs oxygen from the air and is con-. Fig. 64. verted into red vapors, which are at first apparent in the gas-bottle, but as the evolution of nitric oxide continues, the gasin the flask gradually becomes colorless, and may then be col-lected in jars over water. Properties.—Nitric oxide is a colorless gas. It has recentlybeen liquefied by Cailletet. It is decomposable by heat, butlegs easily than the monoxide. It is scarcely soluble in water,which only takes up a twentieth of its volume. Its most charac-teristic property is the energy with which it absorbs half itsvolume of oxygen, passing into the state of nitrogen peroxideor red vapors. 154 ELEMENTS OF MODERN CHEMISTRY. If a jar filled with nitric oxide be opened to the air, the redvapors appear at once. 2N0 + 0 = N^O* Nitric oxide supports the combustion of certain burns in it brilliantly, but the gas does not, likeoxygen and nitrogen monoxide, relight a taper still presentinga spark. Hydrogen decomposes nitric oxide at a temperature butslightly
Size: 1770px × 1412px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade18, booksubjectchemistry, bookyear1887
