A text-book on chemistryFor the use of schools and colleges . ctionwith Chlorine. Carbonic Acid. C02— Acid is commonly prepared by the actionof dilute hydrochloric acid on chalk, or any carbonateof lime, the action being CaO, C02+ITCl= + C02;that is, one atom of carbonate of lime and Fiffm of hydrochloric acid yield one atom ofchloride of calcium and one of water, andone atom of carbonic acid gas is set process may be conducted in a flask,as in Fig. 267, the gas being evolved sorapidly that it may be collected over wa-ter, though that liquid absorbs its own
A text-book on chemistryFor the use of schools and colleges . ctionwith Chlorine. Carbonic Acid. C02— Acid is commonly prepared by the actionof dilute hydrochloric acid on chalk, or any carbonateof lime, the action being CaO, C02+ITCl= + C02;that is, one atom of carbonate of lime and Fiffm of hydrochloric acid yield one atom ofchloride of calcium and one of water, andone atom of carbonic acid gas is set process may be conducted in a flask,as in Fig. 267, the gas being evolved sorapidly that it may be collected over wa-ter, though that liquid absorbs its own vol-ume at the ordinary pressure. Carbonic acid is abundantly formed in many pro-cesses. It is the result of the complete combustion ofcarbonaceous bodies; is evolved during the respirationof animals and in alcoholic fermentation. It was calledfixed air by the old chemists, because a constituent oflimestone. What are the properties of chloro-carbonic acid ? How is carbon-ic acid made? From what natural processes does it arise? Whywas it called fixed air ?. 296 PROPERTIES OF CARBONIC ACID. It is a colorless and transparent gas at common tem-peratures, with a faint smell and slightly acid taste. Itis irrespirable, and acts in a diluted state as a narcoticpoison; even air, containing one tenth of its volume,produces a marked effect; the atmosphere contains onepart in 2000. Its specific gravity is ; 100 cubicinches weigh grains; it may therefore be col-lected by displacement. For the same reason, it col-lects in the bottom of wells and pits, and often suffo-cates workmen who descend into such places. It doesnot support combustion; a lighted taper lowered intoa jar partly filled with it is at once extinguished. Itmay be poured from one vessel to another; and if ajarof it be poured on a candle, the light is at once put density and other qualities may be well illustratedwhen it is formed by the action of fuming nitric acid oncarbonate of ammonia, a smoky cloud ma
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