Barium thiosulfate, preparation

Many other metal thiosulfates, eg, magnesium thiosulfate [10124-53-5] and its hexahydrate [13446-30-5] have been prepared on a laboratory scale, but with the exception of the calcium, barium [35112-53-9] and lead compounds, these are of Httle commercial or technical interest. Although thaHous [13453-46-8] silver, lead, and barium thiosulfates are only slightly soluble, other metal thiosulfates are usually soluble in water. The lead and silver salts are anhydrous the others usually form more than one hydrate. Aqueous solutions are stable at low temperatures and in the absence of air. The chemical properties are those of thiosulfates and the respective cation. 

Thiosulfates are generally prepared by treating aqueous solutions of either calcium or barium thiosulfate with the corresponding carbonate or sulfate of the desired metal. The insoluble calcium or barium sulfates or carbonates are filtered and the thiosulfate recovered from the filtrate by vacuum evaporation. 

This compound may be prepared in solution by dissolving 4.5g of nickel sulfate 7-hydrate in 25ml of water and adding 5g of barium thiosulfate monohydrate. 

The recovered dg-dimethyl sulfoxide may be recycled to prepare additional deuteriomethyl iodide or purified for use as a reagent by gentle warming with a little solid sodium thiosulfate followed by distillation from barium oxide. Both products show 99% deuteration. ... 

Sulfuryl fluoride has been prepared by a number of methods. Most of these consist of the fluorination of a sulfur-oxygen compound, as in the direct reaction of elemental fluorine with sulfur dioxide,1 a metal sulfate, or a metal thiosulfate.2 A well-known exception to this general method is the pyrolysis of barium fluorosulfate 3... 

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