. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. onate, but is applied in a different manner. The result issodium bicarbonate (NaHC03), (Sodii Bicarbonas, Bicarbonateof Sodium, U. S. P.), the old bicarbonate of soda. Na2C03 + H20 + C02 = 2NaHC03. Sodium Water. Carbonic Sodium. carbonate. acid gas. bicarbonate. Process.—Heat crystals of sodium carbonate in a porcelaincrucible until no more steam escapes. Rub the product in a*mortar with two-thir
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. onate, but is applied in a different manner. The result issodium bicarbonate (NaHC03), (Sodii Bicarbonas, Bicarbonateof Sodium, U. S. P.), the old bicarbonate of soda. Na2C03 + H20 + C02 = 2NaHC03. Sodium Water. Carbonic Sodium. carbonate. acid gas. bicarbonate. Process.—Heat crystals of sodium carbonate in a porcelaincrucible until no more steam escapes. Rub the product in a*mortar with two-thirds its weight of more of the crystals, andplace the powder in a test-tube or small bottle, intowhich carbonic acid gas maybe conveyed by a tube pass-ing through a cork and ter-minating at the bottom ofthe vessel. To generate thecarbonic acid gas, fill a test-tube having a small hole inthe bottom (or a similar piece -- Of glass tubing of which one preparation of SodTu^carbonate end is plugged by a grooved cork) with fragments of marble, insert a cork and a delivery- * The water alluded to occurs in the acid, which, though commonlytermed acetic acid, is really a solution of that acid in 84 THE METALLIC RADICALS. tube, and connect the latter with the similar tube of the vesselcontaining the sodium carbonate by a piece of india-rubbertubing. Now plunge the tube of marble into a test-glass orother vessel containing a mixture of 1 part hydrochloric acidand 2 parts water, and loosen the cork of the sodium carbonatetube until carbonic acid gas, generated in the marble tube, maybe considered to fill the whole arrangement; then replace thecork tightly and set the apparatus aside. As the gas isabsorbed by the sodium carbonate, hydrochloric acid risesinto the marble tube and generates fresh gas, which, in itsturn, drives back the acid liquid, and thus prevents the pro-duction of any more gas until further absorption has the salt is wholly converted into bicarbonate
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