Elements of chemistry : including the applications of the science in the arts . acid, it is necessary to divide the weight of each of them by its chemicalequivalent:— = = 1 = These fractions are in the proportion of 2, 3, and 6; from which it follows, that theformula of the crystallized oxalic acid is C2 H3 06 or a multiple of it. Allowingthe 3H to be in combination with 30, as water, we finally obtain the formula C203 + 3HO, for the crystallized acid. CARBON AND HYDROGEN — HYDRIDES OF CARBON. A large number of compounds of carbon and hydrogen are kno
Elements of chemistry : including the applications of the science in the arts . acid, it is necessary to divide the weight of each of them by its chemicalequivalent:— = = 1 = These fractions are in the proportion of 2, 3, and 6; from which it follows, that theformula of the crystallized oxalic acid is C2 H3 06 or a multiple of it. Allowingthe 3H to be in combination with 30, as water, we finally obtain the formula C203 + 3HO, for the crystallized acid. CARBON AND HYDROGEN — HYDRIDES OF CARBON. A large number of compounds of carbon and hydrogen are known; many of themfound in the organic kingdom, and others derived from the decomposition of organiccompounds. Some of these are liquid bodies, some solid, and others gaseous. Atpresent we shall confine ourselves to the three gaseous compounds which in simplicityof composition resemble inorganic compounds. PROTOCARBURETTED HYDROGEN. Light carburelted hydrogen, Gas of the Acetates, Marsh-gas, 16, or 200; C2 H4; density ; combining measure Fig. This gas is a constant product of theputrefactive decomposition of wood andother compounds of carbon, under water,and is most readily obtained by stirringthe mud at the bottom of stagnant pools,and collecting the gas as it rises in an in-verted bottle and funnel (fig. 126). Italways contains 10 or 20 per cent, of car-bonic acid, which may be separated from itby lime-water, and a small proportion ofnitrogen. This gas also issues, in someplaces, in considerable quantities from fis-sures in the earth, coming often from sub-terraneous deposits of coal; and in theworking of coal-mines it is found pent upin cavities, and would appear sometimes tobe discharged from the fresh surface of thecoal in sensible quantity. Hence, this gasis sometimes described as the inflammable 1 Such systematic designations as have hitherto been applied to this and a few otherhydrides of carbon have not in general been clear, and involv
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