A text-book on chemistryFor the use of schools and colleges . d Properties.— Constitution.—Relations with Free Oxygen. Hyponitrous Acid.—Preparation and Properties. Protoxide of Nitrogen. NO—12. ? If nitrate of ammonia be exposed to a temperature of^24! 350° in a retort, Fig. 241, it is decomposed, being resolved intowater and the protoxide of ni-trogen. The former condensesin the neck of the retort, the lat-ter rises into the jar. If whitishfumes are evolved, they indicatethat the temperature is too decomposition is very simple. N05+NH3=2(NO) + 3(£TO).One atom of the salt yields two
A text-book on chemistryFor the use of schools and colleges . d Properties.— Constitution.—Relations with Free Oxygen. Hyponitrous Acid.—Preparation and Properties. Protoxide of Nitrogen. NO—12. ? If nitrate of ammonia be exposed to a temperature of^24! 350° in a retort, Fig. 241, it is decomposed, being resolved intowater and the protoxide of ni-trogen. The former condensesin the neck of the retort, the lat-ter rises into the jar. If whitishfumes are evolved, they indicatethat the temperature is too decomposition is very simple. N05+NH3=2(NO) + 3(£TO).One atom of the salt yields two atoms of the protoxideof nitrogen and three of water. One ounce of the ni-trate produces two gallons of the gas. The protoxide of nitrogen is a colorless transparentgas, having a sweetish taste. It is soluble in water,that liquid dissolving about its own volume of the gas,but giving it up on being boiled. Its specific gravity A hundred cubic inches weigh grains; it How may protoxide of nitrogen be made ? What are its proper-ties ?. ITS PROPERTIES. 259 is therefore half as heavy again as air, and may be col-lected by displacement, the specific gravity being thesame as that of carbonic acid. It may be liquefied at45° by a pressure of fifty atmospheres, and at 150° be-low zero freezes into a transparent crystalline solid. Inthe liquid form it is colorless, and boils at —125°, Adrop of it falling on the skin produces the effect of aburn. Mercury sinks in it and freezes into a liquid protoxide mixed with bisulphide of carbonproduces the lowest temperature yet attained, —220°.If the liquid be forced into the air from a jet, a partfreezes into a solid, the same occurring when it evapo-rates in vacuo. It is composed by atom of one of nitro-gen and one of oxygen, and by volume of two of nitro-gen united to one of oxygen, condensed into two vol-umes—a constitution like that of water. As it containshalf its volume of oxygen, it supports combust
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