ACIDITY

n. ’i?-ti?,_ Gi ums. Lat., acid it as. Fr., acid ité, aigreur (2d def.). Ger., Aci Säureverhalten. It., acid ità, agrezza (2d def.). Sp., acidez, dcidos del estômago (2d def.). syn.: sourne . 1. In chemistry the word is used in different senses, denoting: a. The quality of po e ing the characteristics of an acid, and so, in acids or acid salts, equivalent to basicity. b. The capacity for saturating an acid evinced by a base. (In the former case the a. is me as by the number of hydrogen atoms in one molecule of the acid or salt replaceable by combination with a base; in the latter case it is measured by the number of Hydrogen atoms which a molecule of the base can replace by combining with an acid. The degree of a. is designated by the terms monacid, diacid, and triacid, accordingly as the replacement affects 1, 2, or 3 atoms of hydrogen.) c. The intensity of acid reaction shown by a substance. It is measured by the amount of a standard solution of an alkali required to render the substance neutral. [B.] 2. Sourne of the stomach; the over-production of acid in the stomach. characterized by a sensation of burning and distension and acid eructations or regurgitations. The term a. of the humors was used by the older writers to expre an acid state of the blood or some Gee ale the body as a cause of disease, but the doctrine is now loned.