Achilles Tatius

Rhetorician of 5th century. He wrote the romance of Cleitophon and Leucippe, one of the best of Greek love stories. having one replaceable hydrogen atom is a monobasic acid; for example, HCl. Dibasic acids are those containing two atoms of replaceable hydrogen; as H2SO4. Similarly there are tribasic, tetrabasic, pent a basic acids, etc. If the proportion of oxygen varies, then that one containing the larger proportion of oxygen is given a name ending in ic; to the one having the smaller proportion of oxygen. a name ending in ous. If there is a third, with a still smaller proportion of oxygen, the prefix hypo is used in connection with the descriptive term. Thus the compound H2SO4 is called sulphuric acid; H,SO,, sulphurous acid; H2SO4, hyposulphurous acid. An acid containing the same elements, but a larger proportion of oxygen than H2SO4, is designated persulphuric. In designating hydracids the names of the elements in the compound are generally used; thus HCl is either hydrochloric or chlorhydric acid. An organic acid is a combination of one or more carboxyl (COOH) groups, or one or more acid groupings derived from a mineral acid with any organic grouping, but this union is directly with a carbon atom. Examples: acetic acid, CH,. COOH., benzene-sulphonic acid, C2H2SO4.OH. Both mineral and vegetable acids enter largely into human food, usually in combination as salts. From a medical standpoint these bodies are divided into three cla es: one including those whose action depend upon the elements from which they are derived, as, for example, phosphoric acid; another embracing those, such as carbolic acid, which have properties peculiar to themselves; and a third which takes in those used principally as neutralizers of alkalies and as corrosives, and is the cla most commonly termed acids. It includes the mineral acids, nitric, muriatie and sulphuric; and the organic acids, acetic, citric and tartaric. The mineral acids are highly corrosive and are used to ing yeast and bacteria.