| 释义 |
oxyacid, oxy-acid Chem.|ɒksɪˈæsɪd|
Also oxi-, ox-acid.
[f. oxy- 2 + acid.]
1. An acid containing oxygen (e.g. carbonic acid, CH2O3) as distinguished from a hydracid formed by the union of hydrogen with a halogen (e.g. hydrochloric acid, HCl).
1836–41Brande Chem. (ed. 5) 1032 It is obvious..that there are no salts, properly so termed, in which the oxy-acids are combined with silica, but that silicium forms haloid compounds. 1849Noad Electricity (ed. 3) 224 The hypothesis of Davy developing the general analogy of all salts, whether derived from oxyacids or hydracids. 1882Roscoe Elem. Chem. vi. 56 All acids contain hydrogen, combined either with an element, or with a group of elements, which almost always contain oxygen, and in this case the substances are termed oxy-acids.
b. attrib. or adj. Of or belonging to an oxyacid.
1854J. Scoffern in Orr's Circ. Sc., Chem. 352 The attempt to assimilate oxyacid salts with the type of hydracid salts.
2. Organic Chem. In plural, a name given to several series of acids derived from those of the fatty or the aromatic series, by the substitution of one or more hydroxyl for one or more hydrogen atoms; hence called more exactly hydroxy-acids.
The diatomic monobasic acids derived from the fatty acids (CnH2nO2) have the formula CnH2nO3, and constitute the fatty oxy-, (hydr)oxy-fatty, or lactic series. The diatomic monobasic acids derived from the aromatic group or benzene derivatives (CnH2n - 8O2) have the formula CnH2n - 8O3, and constitute the aromatic oxy-acids or (hydr)oxy-aromatic series.
1877Watts Fownes' Chem. (ed. 12) II. 317 These acids are called lactic acids, after the most important member of the series, and oxy-fatty acids, because they may be derived from the acids CnH2nO2 by the substitution of OH for H; thus: CH3.CO2H Acetic acid; CH2OH {b1} CO2H Oxyacetic acid. Ibid. 534 These aromatic oxy-acids, like the corresponding acids of the fatty series (the lactic acids), exhibit alcoholic as well as acid characters. 1885I. Remsen Introd. Organ. Chem. 155 The first class which presents itself is that of the alcohol acids or acid alcohols; that is, substances which combine within themselves the properties of both alcohols and acids. They are commonly called oxy-acids or hydroxy-acids. |