ANHYDRIDE

n. A?®n-hi’dri?d(drid). From « priv., and vôwp, water. Fr., anhydride. Ger., An hydrid. It., anidride. Sp.… anhidrido. Syn.: acid (or acid-forming) oxide, An oxide derived from an oxy-acid or other oxy-compound (such as an alcohol)'by the lo of the elements of one or more molecules of water; e. g.. carbonic acid, H,CO3, Reneiyed of the elements of a molecule 01 water, H,0, becomes carbonic a. (carbon dioxide), CO, The a’s are often erroneously called anhydrous acids. They have the same relation to acids that anhydrous (secondary) oxides have to hy: drates (primary oxides); they represent oné or more molecules of A8n-edr. Anhydrous; as a n., an an- Asn-e-dre?m-e. See Anal water in which the whole of the hydrogen is replaced by one or more negative radicles, while the corresponding acids represent one or more molecnles of water in which such radicles replace one half of the hydrogen. The a’s are more or le quickly converted into acids by the action of water or of hydrates. They are of three cla es: 1, Those deriving from one inolecule of water by the relace ment of H, by two molecules of a monatomic acid radicle. 2. ‘hose deriving trom one molecule of water by the replacement of H, by one atom of a diatomic acid radicle. 3. Those deriving from three molecules of water by the aoe of H, by two molecules of a triatomic acid radicle. [B,2.] For the particular a’s, see under the corresponding acids.—A. of an alcohol. See under Hex atomic ALCOHOL. — À. saligénique (Fr.), Saliretin (the a. of saligenin), [B.]—A. santon i que (Fr.). Santonin. [B.] —Antimonic a. See Antimony pen to vide.—Arsenions a. See Arsenic trioxide.—Carbonic a. See Carson dioxide.—Ethereal a. Ger., Hsteranhydrid. The a. of a fatty acid, formed by the dednction of the elements of water from a donble molecule of the acid. The removal of one molecule of water produces the first e.a., and that of two molecules the second e. a. ‘Chus, from lactic acid, CsH,0s, are formed succe ively the first e. a., CsH,005, and the second e. a., CgHgO,. [B, 4.|—First ethereal a. Ger., erstes Ester an hydrid. “See under Ethereal a.—Mixed a. Ger., gemischtes An hydrid. Ana. made up of the acid radicles of two di imilar fatty acids united by an atom of oxygen; general formula, CaHgn—, O—O— CnHam—; 0. [B,4.]—Second ethereal a. Get., zweites Esterankydrid, Seo under Ethereal a.—Simple a. Ger., ein- JSaches An hydrid. An ethereal a. made up of two similar fatty-acid Tadicles united by an atom of oxygen; general formula, (CoHg2—; 0),=0. [B, 4]