. Essentials of medical and clinical chemistry. With laboratory exercises . lorless liquid in the cold end of the tube. 77 The absorption of ammonia gas by water may be illustrated by filling alarge bottle with the gas by upward displacement, and closing the mouthwith a rubber cork through which passes a glass tube sealed at its outer end. Ifthis sealed end be plunged under water and broken off, the water rushes informing a beautiful fountain (Fig. 24). If the water be colored red withlitmus, it will become blue as it enters the bottle, showing that the water hasbecome alkaline. PART I.âINORGA
. Essentials of medical and clinical chemistry. With laboratory exercises . lorless liquid in the cold end of the tube. 77 The absorption of ammonia gas by water may be illustrated by filling alarge bottle with the gas by upward displacement, and closing the mouthwith a rubber cork through which passes a glass tube sealed at its outer end. Ifthis sealed end be plunged under water and broken off, the water rushes informing a beautiful fountain (Fig. 24). If the water be colored red withlitmus, it will become blue as it enters the bottle, showing that the water hasbecome alkaline. PART I.âINORGANIC CHEMISTRY. 57 liberal use on the unconscious patient cause spasm of the glottisor set up a dangerous bronchitis. Tests,âThe gas may be recognized by (a) its smell, (/£) whitefumes with HO, (c) turning moistened red litmus blue. Itscompounds must be warmed with a strong alkali78 to liberate theammonia gas, which can then be recognized as just described. Amost delicate test is Nesslers Reagent,79 which gives a yellowishbrown with ammonia or its compounds. Fig. Nitrogen Oxides. M onoxideâN20 + H20 = 2HNO = Hyponitrous âN202. No corresponding âN203 + H20 =â 2HN02 = Nitrous âN204. No corresponding âN205 -f H20 = 2HNO3 = Nitric acid- 78 Mix lime with NH4C1 and heat in a test-tube. Test the NH3 as above de-scribed, and expose to it a paper moistened with CuS04 solution, and note thedeep blue ammonio-sulphate of copper formed. 79 Nesslers Reagent. Dissolve 35 gm. of Kl in 100 Cc. of water and 17 HgQ2 in 300 Cc. of water; add the first to the second until the precipitatefirst formed is almost re-dissolved. Then add 20 per cent. NaHO solution,enough to make one liter. 58 ESSENTIALS OF CHEMISTRY. Nitrogen MonoxideâN20 {Nitrous OxideâLaughing Gas),âPrepared by heating ammonium nitrate,80 as shown in Fig. 25. NH4N08 = N20 + 2H20. Physical Properties.âColorless, odorless gas, of sweetish keep it
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