| 释义 |
hyposulphite Chem.|hɪpəʊ-, haɪpəʊˈsʌlfaɪt|
[ad. F. hyposulfite: see hypo- 5 and sulphite.]
A salt of hyposulphurous acid. a. Originally (and still commercially) applied to the salts now called by chemists thiosulphates; as hyposulphate of soda = sodium thiosulphate.
1826Henry Elem. Chem. II. 136 Hypo-sulphite of silver may be formed by mixing hyposulphite of soda with dilute nitrate of silver, or by dissolving chloride of silver in any of the hypo-sulphites. Though formed of ingredients that have a metallic and very bitter taste, its flavour is intensely sweet. 1868–72Watts Dict. Chem. V. 540 Allied to the sulphates there is a group of salts called thiosulphates, or more frequently hyposulphites. 1894Roscoe & Schorlemmer Chem. I. 412 Thiosulphuric acid..forms a series of stable salts known as the thiosulphates (hyposulphites).
b. Now, with chemists, a salt of the acid H2S2O4, formerly called a hydrosulphite.
1872Watts Dict. Chem. Suppl. VI. 1063 The formation of thiosulphates..is only a secondary reaction due to the slow and spontaneous decomposition of the hyposulphite. 1877― Fownes' Chem. (ed. 12) I. 213 The solution..solidifies in a few hours to a mass of slender colourless needles, consisting of sodium hyposulphite. 1894Roscoe & Schorlemmer Chem. I. 409 Sodium hyposulphite (Na2S2O4) is employed by the dyer and calico-printer for the reduction of indigo, as it possesses the same reducing properties as the free acid. |