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To Obtain Oxygen Gas

Heat in a retort or flask, finely powdered chlorate of potassa, mixed with about one-fourth its weight of black oxide of manganese. The gas must be collected by attaching a tube to the flask, and passed into a receiving bottle in a pneumatic trough. (See No. 4031.) distinguished from the other gaseous bodies Or: Take chloride of potassa, or red oxide by the name of air. (See No. 4072.) Gases of mercury, expose it to the heat of a spirit for chemical purposes are usually generated lamp, in a suitable vessel, and collect the in a bottle of glass or other appropriate ma- gas. terial; or, where the application of heat is 4036. Oxygen Gas from Bleaching necessary, in a retort. A connecting tube of Powder. Oxygen gas can be readily preconvenient shape is fitted air-tight into the pared by boiling bleaching powder (hyponeck or beak of the generating vessels, through which the gas is led into receiving vessels. These are usually bottles, with accurately fitting stoppers. chlorite of lime) and nitrate of cobalt in a flask. Make a clear solution of the powder in water, put it into any convenient flask provided with a perforated cork and tube, and GAS. pour in a few drops of a solution of nitrate or pass the gas first through alcohol, and then chloride of cobalt, and set it to boil. The through a concentrated solution of pure pure pogas, as it is evolved, is collected in a receiving tassa. Care must be taken that all the air has bottle. (See No. 4031.) 4037. To Obtain Oxygen Without Heat. According to M. Boettger, oxygen been driven out of each vessel before any light is applied, or an explosion will ensue. 4043. Cheap Method of Obtaining can be obtained in a very pure state by em- Hydrogen. Take quicklime, slack it, let it ploying binoxide of barium and peroxide of lead. Take equal parts of these substances and pour on weak nitric acid; the reaction commences immediately, and the gas can be collected as usual over cold water. (See No. 4031.)