A text-book on chemistry : for the use of schools and colleges . wo of water, besides subsalts. Aconitic Acid—Equisetic Acid(GJSOa -f- HO)—is form-ed by fusing citric acid, and the resulting brown productis dissolved in water, the change being Cl3HHOu ...=... 3(C,HO,) + 5(110),that is, one atom of hydratcd citric acid yields three ofaconitic acid and five of water. Aconitic acid is remark-able from occurring naturally in the Aconitum Napellus andEquisetum Fluviatile. Malic Acid (Cg/^Og-f- 2IIO), a bibasic acid, occur-ring in the juice of apples and other fruits. It may alsobe prepared from the
A text-book on chemistry : for the use of schools and colleges . wo of water, besides subsalts. Aconitic Acid—Equisetic Acid(GJSOa -f- HO)—is form-ed by fusing citric acid, and the resulting brown productis dissolved in water, the change being Cl3HHOu ...=... 3(C,HO,) + 5(110),that is, one atom of hydratcd citric acid yields three ofaconitic acid and five of water. Aconitic acid is remark-able from occurring naturally in the Aconitum Napellus andEquisetum Fluviatile. Malic Acid (Cg/^Og-f- 2IIO), a bibasic acid, occur-ring in the juice of apples and other fruits. It may alsobe prepared from the stalks of rliubarb, in which it occurswith oxalate of potash. It is a colorless solid, soluble inwater, the solution changing by keeping. When heatedin a retort, it melts, and then boils, emitting a volatile Describe the action of heat on tartaric acid. From what source is citricacid obtained ? How many classes of salts does citric acid yield ? Whatsubstance results from the fusion of citric acid ? From what sources ismalic acid derived ? TANNIC ACID. 365. acid, the Maleic Acid, C6H2O0 + 2H0, which condenseswith the water in the receiver; at the same time thereforms in the retort crystalline scales of Fumaric Acid,C{HOn + HO, which may he separated from the unchang-ed malic acid by solution in cold water. It is to be ob-served that maleic, fumaric, and aconitic acids are isomer-ic bodies. Tannic Acid (ClsHr,09 + 3HO).—An astringent princi-ple found in the bark of the oak, nut-galls, and Fig. vegetable productions. It may be sep-arated by placing in a vessel, b, Fig. 272,powdered galls. On pouring on them sulphu-ric ether, a liquid drops through the funneltube, c, into the bottle, a, spontaneously sepa-rating into two portions; the lower, which isa solution of tannic acid in water, is to be de-canted and evaporated in presence of sul-phuric acid in vacuo. It yields tannic acid,or tannin, in the form of an uncrystallizedmass. This acid is soluble in water, but mu
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