Silver dithionate

When silver sulphite or a mixture of sodium sulphite and silver nitrate is heated in boiling aqueous solution, decomposition occurs with formation of silver dithionate.1... 

When heated alone, 10 per cent, decomposes as indicated, and the remainder is converted into silver dithionate and metallic silver 5... 

Silver dithionate, AgaS206.—The dithionate is formed by heating the sulphite (p. 333), and also by dissolving silver carbonate in dithionic add. The rhombic crystals darken under the influence of light, and dissolve in twice their weight of water at 16° C. 

Heavy water, see Hydrogen[ H] oxide Heazlewoodite, see rn-Nickel disulfide Hematite, see Iron(III) oxide Hermannite, see Manganese silicate Hessite, see Silver telluride Hieratite, see Potassium hexafluorosilicate Hydroazoic acid, see Hydrogen azide Hydrophilite, see Calcium chloride Hydrosulfite, see Sodium dithionate(III)... 

The silver(II) oxidation of dithionate " is of interest because this reductant is rather inert and oxidation is often preceded by rate-determining disproportiona-... 

Dithionous acid, 23 669 Dithiopolyesters, 23 739 Dithiozone extraction method, silver analysis via, 22 651 Dithizone, molecular formula, 5 713t Ditins, 24 826... 

With sodium thiosulphate the arsenite forms oxythioarsenates (see p. 282), as it also does with tri- and tetra-thionates sodium dithionate does not react either in cold or boiling solution. Sodium tellurate causes oxidation to arsenate.1 An ammoniacal solution of silver azide is reduced to silver by sodium arsenite other metallic azides do not react. 

Sodium dithionate, Na2S206.1—The dithionate is obtained by the action of sodium carbonate on barium dithionate.2 It is the principal product formed by boiling sodium silver sulphite with water 3... 

The method given here employs the commercially available ammonium (4-)-ff-bromocamphor-7t-sulfonate instead of the more expensive silver salt used by Werner, and it gives higher yields of enantiomers. - The chloride, bromide, and ni trate of the ( + ) series can be prepared from the precipitated (+)(+)-bro-mocamphorsulfonate diastereoisomer by metathesis with the appropriate concentrated acid, whereas the chloride, bromide, and nitrate of the (—)-series can be prepared by treatment with the appropriate concentrated acid of the (—)-dithionate precipitated from the diastereoisomer filtrate. 

Kinetic studies of the oxidation reactions of dithionate (820 ) appear to be limited to early work and a recent examination of the reaction with silver(II). Oxidation by iodine , and by bromate, iodate and dichromate were all shown to occur through slow disproportionation to sulphite, viz. 

Margalith et al. (1966) demonstrated that T. ferrooxidans grown on iron could oxidize sulfur but the rate of oxidation was lower than with iron however, sulfur-grown cells of T. ferrooxidans could also oxidize sulfite, dithionate, thiosulfate, tetrathionate and sulfide but not thiocyanate (Silver, 1970). Details of the specific metabolic reactions for sulfur oxidation by T. ferrooxidans have been outlined in an earlier publication (Lundgren et al., 1974). 

DITHION or DITHIONE (3689-24-5) Hydrolyzes slowly in water. Incompatible with antimony(V) pentafluoride, lead diacetate, magnesium, silver nitrate. Corrodes iron. 

When alkali metal sulphites are mixed with silver nitrate solution in equimolar ratio, and the solution heated to boiling, the alkali metal dithionate is formed together with finely divided silver. The initial stage is preparing potassium sulphite. 

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