. Inorganic chemistry . istsin burning charcoal in oxygen; the other is an analytic one—namely, the displacement of carbonic acid from one of itscompounds, such as the carbonate of calcium. 371. We have described, under oxygen, the arrangementrequired for burning charcoal in that gas (par. 257). When char-coal, C, is burned in oxygen, O, till the latter is converted intocarbonic acid, COj, no change in volume occurs, so that a cubicfoot, for example, of oxygen, after it is saturated with carbon,forms ? exactly a cubic foot of carbonic acid. Although theoxygen is not increased in volume by its
. Inorganic chemistry . istsin burning charcoal in oxygen; the other is an analytic one—namely, the displacement of carbonic acid from one of itscompounds, such as the carbonate of calcium. 371. We have described, under oxygen, the arrangementrequired for burning charcoal in that gas (par. 257). When char-coal, C, is burned in oxygen, O, till the latter is converted intocarbonic acid, COj, no change in volume occurs, so that a cubicfoot, for example, of oxygen, after it is saturated with carbon,forms ? exactly a cubic foot of carbonic acid. Although theoxygen is not increased in volume by its conversion intocarbonic acid, we need scarcely say that it is altered in weight,so that for every thirty-tvvo parts of oxygen, we obtain, in virtue ofits combination with twelve of carbon, forty-four of carbonic acid. 372. The production of carbonic acid during the combus-tion of charcoal is demonstrated by adding lime-water, CaO,to the jar originally full of oxygen in which the charcoal was Inorganic Chemistry. 125. Kg. 35- burned. The lime-water at once becomes milky, from thecombination of the carbonic acid, CO2, with the lime, CaO, andthe consequent production of carbonate of calcium, CaCOg. 373. The analytic process for carbonic acid is the onegenerally followed. Fragments of broken marble are placed insuch a vessel as was used in thepreparation of hydrogen or nitricoxide, and hydrochloric acid dilutedwith water is poured over the acid may be collected atthe pneumatic trough, or by displace-ment of air—^namely, by passing thegas to the lower part of a jar standingupright (fig. 35). Where carbonicacid is required in large quantity, asin charging soda-water, it is preparedfrom chalk and sulphuric acid. 374. Any carbonate will yield car-bonic acid if exposed to the action of the stronger acids, suchas sulphuric, hydrochloric, nitric, or acetic. 375. The evolution of carbonic acid by the action of astronger acid on a carbonate, admits of a simple explanatio
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