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Carbonic Acid (Comtilled water for a few)

An acid comtilled water for a few minutes, and filter while pound, formed by the union of carbon with hot through purified animal charcoal. (Sec oxygen, sometimes called choke-damp. No. 1752). Set aside to crystallize, and dry colorless gas possessing a pungent odor and the crystals on bibulous paper. If not suffi- acidulous taste, rapidly absorbed by water, ciently free from color, dissolve the crystals forming liquid carbonic acid. The agreeable in boiling distilled water, filter through a pungency of ale, beer, porter, wine, &c., is in fresh portion of the charcoal, and crystallize a great measure owing to the presence of again. (U. S. Ph.) carbonic acid, which they lose on exposure to 3907. Το Obtain Gallic Acid from the air, and then become flat and stale. Tannin. Add a strong aqueous solution of Spring and well water contain carbonic acid, tannic acid (tannin) to sulphuric acid, as long and water that has been boiled has an insipid as a precipitate falls; collect the powder, taste, from its absence. Under a pressure of wash, and dissolve it by the aid of heat in 36 atmospheres at 32° Fahr. it becomes diluted sulphuric acid; boil for a few min- fluid, and on the pressure being removed, utes, cool, and collect the crystals of gallic congeals, from the cold produced by its rapid acid which will form in considerable quantity. evaporation. It has been estimated that the 3908. To Distinguish Gallic Acid temperature falls to 180° in this experiment. from Tannic Acid. Gallic acid does not Carbonic acid gas is destructive to life, and affect solutions of gelatine, the protosalts of extinguishes combustion. An atmosphere coniron, or the salts of the alkaloids; but it pro- taining more than its natural quantity (about duces a black precipitate with the sesquisalts τόσο), is unfit for respiration. The air of wells, of iron, which disappears when the liquid is cellars, brewers' vats, &c., is frequently contaminated with this gas (choke-damp); hence