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dithionic
dithionic, a. Chem. (daɪθaɪˈɒnɪk, dɪθɪˈɒnɪk) [f. di-2 + θεῖον sulphur + -ic. (The formative -thionic is used for a group of compounds containing H2O6, in combination with two or more atoms of sulphur.)] In dithionic acid, a synonym of hyposulphuric acid, H2S2O6, a dibasic acid not isolated in the pu...
Oxford English Dictionary
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Dithionic acid
Dithionic acid, H2S2O6, is a chemical compound known only in solution.
Salts
Dithionic acid is diprotic and salts called dithionates are known. converted to dithionate salts of other metals by metathesis reactions:
Ba2+() + MnS2O6() + MnSO4() → BaSO4()↓ + BaS2O6·2H2O()
Concentrated solutions of dithionic
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Dithionate
The dithionate (or metabisulfate) anion, , is a sulfur oxoanion derived from dithionic acid, H2S2O6.
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trithionic
trithionic, a. Chem. (traɪθaɪˈɒnɪk) [f. tri- 5 + Gr. θεῖον sulphur + -ic.] In trithionic acid, H2S3O6, an acid containing three atoms of sulphur in the molecule, discovered by Langlois in 1842 (Ann. Chim. Phys. IV. 77), known only in aqueous solution, which is inodorous, sour, and bitter, and in its...
Oxford English Dictionary
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pentathionic
pentathionic, a. Chem. (ˌpɛntəθaɪˈɒnɪk) [irreg. f. penta- + Gr. θεῖον sulphur + -ic: see dithionic.] In pentathionic acid, an acid containing five atoms of sulphur in the molecule, H2S3O6, colourless, inodorous, and of bitter taste. Hence pentathionate (-ˈθaɪənət), a salt of pentathionic acid. In qu...
Oxford English Dictionary
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Polythionic acid
Dithionic acid (H2S2O6) does not belong to the polythionic acids due to strongly different properties. Names of polythionic acids are determined by the number of atoms in the chain of sulfur atoms:
– dithionic acid
– trithionic acid
–
– , etc.
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monothionic
monothionic, a. Chem. (mɒnəʊθaɪˈɒnɪk) [See mono- 2 and dithionic.] In monothionic acid, a very unstable fluid, H2SO2, obtained by the action of diluted sulphuric acid on iron or zinc, with exclusion of air.1891 in Syd. Soc. Lex.
Oxford English Dictionary
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Hypophosphoric acid
See also
Dithionic acid, the sulfur equivalent.
References
Mineral acids
Phosphorus oxoacids
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polythionic
polythionic, a. Chem. (pɒlɪθaɪˈɒnɪk) [f. poly- + -thionic, f. Gr. θεῖον sulphur: see dithionic.] Containing several atoms of sulphur in combination with H2O6 (distinguished from sulphuric, in which S is combined with H2O4); in polythionic acids, a general name for the acids of this constitution, e.g...
Oxford English Dictionary
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hyposulphuric
† hyposulˈphuric, a. Chem. Obs. [ad. F. hyposulphurique; see hypo- 5 and sulphuric.] In hyposulphuric acid, old name of dithionic acid.1819 J. G. Children Chem. Anal. 433 The authors [Welter and Gay Lussac] propose to name this new acid, the hyposulphuric, by analogy with the hyposulphurous, to deno...
Oxford English Dictionary
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hydrosulphurous
† hydrosulphurous, a. Chem. Obs. (-ˈsʌlfjʊrəs) [f. as prec. + sulphurous.] In hydrosulphurous acid, a name given first to dithionic acid; afterwards to hyposulphurous acid, or hydrogen hyposulphite, H2S2O4.1855 in Mayne Expos. Lex. 1872–94 [see hyposulphurous].
Oxford English Dictionary
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thio-
thio- (θaɪəʊ) also before a vowel thi-, repr. Gr. θεῖον sulphur; a formative element in names of things containing or connected with sulphur. 1. in Chem. (See also thiol-, thion-.) In names of compounds containing sulphur = sulpho-. In systematic nomenclature restricted to those in which one or more...
Oxford English Dictionary
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