Chemical lecture experiments . ssed through a glass AMMONIA 191 tube thrust through a three-holed cork in the neck of a smallbottle containing a 2 cm. layer of sulphuric acid. A streamof nitric oxide (Ex. 49, p. 211) passes through a second glasstube into the bottle. Both tubes dip beneath the surface ofthe sulphuric acid that their rate of bubbling may be is conducted throughthe whole apparatus to drive outall air and then the nitric oxidegenerator started. The current ofhydrogen should be three timesas fast as the current of nitricoxide. The mixed gases are thenconducted thr
Chemical lecture experiments . ssed through a glass AMMONIA 191 tube thrust through a three-holed cork in the neck of a smallbottle containing a 2 cm. layer of sulphuric acid. A streamof nitric oxide (Ex. 49, p. 211) passes through a second glasstube into the bottle. Both tubes dip beneath the surface ofthe sulphuric acid that their rate of bubbling may be is conducted throughthe whole apparatus to drive outall air and then the nitric oxidegenerator started. The current ofhydrogen should be three timesas fast as the current of nitricoxide. The mixed gases are thenconducted through a piece of com-bustion-tubing or a bulb-tube containing platinized asbestos(Fig. 83). Until the asbestos is heated no ammonia ispresent in the issuing gases, which redden on exposure tothe air; but on heating the asbestos a strong test for am-monia is immediately obtained and no red fumes are formed. 2 NO + 5 H2 = 2 NH3 + 2 H20. H generator ; NO generator ; wash-bottle, with 3-holed cork ; bulb-tube ; platinized Fig. 83 17. From ammonium hydroxide and potassium hydroxide. Strong ammonium hydroxide is allowed to drop from a sep-arating-funnel upon solid potassium hydroxide, preferably inthe stick form, in a 500 cc. Erlenmeyer flask (Fig. 3, p. 11).The dropping-funnel is placed in a two-holed rubber stopper,and a glass elbow conducts away the gaseous ammonia liber-ated. In the process of the reaction the contents of theflask become very cold from the volatilization of ammonia,and consequently the gas is quite dry. However, in allexperiments where a perfectly dry gas is required it shouldbe first conducted through a U-tube containing dry quick- 192 CHEMICAL LECTURE EXPERIMENTS lime or soda-lime. This method is by far the most conven-ient and available one for obtaining varying quantities ofammonia on the lecture table. Apparatus, Fig. 3, p. 11 ; 500 cc. flask ; dropping-fuunel ; stickKOH ; con. NH4OH. 18. By heating ammonium hydroxide. — One of the mostconvenient
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