| 单词 |
polybasic |
| 释义 |
polybasic, a. Chem.|pɒlɪˈbeɪsɪk|
[f. poly- + basic. So F. polybasique.]
Requiring more than one equivalent of base for neutralization; containing two or more atoms of hydrogen capable of replacement by a base. Formerly also applied to salts derived from polybasic acids by replacement of more than one hydrogen atom.
1842Parnell Chem. Anal. (1845) 68 By a polybasic acid is meant an acid, one equivalent of which requires more than one equivalent of a base to form a neutral salt. 1851H. Watts tr. Gmelin's Hand-bk. Chem. V. 225 Phosphate of ferric oxide, or ferric phosphate... Polybasic. 1880E. Cleminshaw Wurtz' Atom. The. 76 The discovery of polybasic acids proved a serious difficulty to the theory of equivalence. 1889G. M'Gowan tr. Bernthsen's Text-bk. Org. Chem. 206 The tri- and polybasic alcohols are capable of yielding the most various products upon oxidation. 1926H. G. Rule tr. J. Schmidt's Textbk. Org. Chem. 59 These differences are so considerable that they may be used to distinguish between mono- and polybasic acids. 1972Norman & Waddington Mod. Org. Chem. xxi. 321 Polyester fibres are formed by condensation of polyhydric alcohols and polybasic acids.
Hence polybasicity |-beɪˈsɪsɪtɪ|, the property of being polybasic.
1890in Cent. Dict. 1912E. Feilmann tr. Molinari's Treat. Inorg. Chem. 46 In 1835 Graham demonstrated the polybasicity of phosphoric acid. 1931Jrnl. Physical Chem. XXXV. 2226 (heading) The polybasicity of several common sugars. |
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