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Sodium thiosulfate (sodium thiosulphate) is an inorganic compound with the formula Na 2 S 2 O 3 ·(H 2 O) x. Typically it is available as the white or colorless pentahydrate (x = 5), which is a white solid that dissolves well in water. The compound is a reducing agent and a ligand, and these properties underpin its applications. [2]
Thiosulfate (IUPAC-recommended spelling; sometimes thiosulphate in British English) is an oxyanion of sulfur with the chemical formula S 2 O 2− 3.Thiosulfate also refers to the compounds containing this anion, which are the salts of thiosulfuric acid, such as sodium thiosulfate Na 2 S 2 O 3 and ammonium thiosulfate (NH 4) 2 S 2 O 3.
Sodium tetrathionate is formed by the oxidation of sodium thiosulfate (Na 2 S 2 O 3), e.g. by the action of iodine: [1] 2 Na 2 S 2 O 3 + I 2 → Na 2 S 4 O 6 + 2 NaI. The reaction is signaled by the decoloration of iodine. This reaction is the basis of iodometric titrations. Other methods include the coupling of sodium bisulfite with disulfur ...
Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate—commonly called hypo—and ammonium thiosulfate—commonly used in modern rapid fixer formulae. [1] Fixation by thiosulfate involves these chemical reactions (X = halide, typically Br −): [2]
Thioglycolic acid is prepared by reaction of sodium or potassium chloroacetate with alkali metal hydrosulfide in aqueous medium. [19] It can be also prepared via the Bunte salt obtained by reaction of sodium thiosulfate with chloroacetic acid: [7] [20] ClCH 2 CO 2 H + Na 2 S 2 O 3 → Na[O 3 S 2 CH 2 CO 2 H] + NaCl Na[O 3 S 2 CH 2 CO 2 H] + H 2 ...
The acid cannot be made by acidifying aqueous thiosulfate salt solutions as the acid readily decomposes in water. The decomposition products can include sulfur, sulfur dioxide, hydrogen sulfide, polysulfanes, sulfuric acid and polythionates, depending on the reaction conditions. [6]
In the wet oxidation method, K 2 FeO 4 is prepared by oxidizing an alkaline solution of an iron(III) salt. Generally, this method employs either ferrous (Fe II) or ferric (Fe III) salts as the source of iron ions, calcium, sodium hypochlorite (Ca(ClO) 2, NaClO), sodium thiosulfate (Na 2 S 2 O 3) or chlorine (Cl 2) as oxidizing agents and, finally, sodium hydroxide, sodium carbonate (NaOH, NaCO ...
Protocols call for degradation of EMS in an equal volume of a 0.1M NaOH and 20% w/v sodium thiosulfate "inactivating solution", for at least six half-lives (>24 hours). [6] The half-life of EMS in 1M NaOH is 6 hours at room temperature, while in a 10% w/v sodium thiosulfate solution it has a half-life of 1.4 hours. [13]