Essay on Synthesis and Chemistry of K2S2O8 - 2122 Words

SYNTHESIS AND CHEMISTRY OF K2S2O8 ABSTRACT In this experiment, a sample of K2S2O8 was prepared by the electrolysis of an aqueous solution of H2SO4 and K2SO4. The peroxodisulfate anion, S2O82-, was also observed for its ability to serve as a counterion for precipitation by preparing a copper (II) complex by reacting hydrated copper (II) sulfate with ammonium peroxodisulfate in the presence of pyridine. This same ability, coupled with its strong oxidizing ability allowed for stabilization of the unusual oxidation state of 2+ for silver which was observed by preparing an analogous silver (II) complex by reacting silver (I) nitrate with ammonium peroxodisulfate in the presence of pyridine. IR spectra for the three products were†¦show more content†¦Thus, it is an important and popular tool for structural elucidation and compound identification. EXPERIMENTAL METHOD A. Preparation of potassium peroxodisulfate A potential set-up was prepared wherein the 25 x 150 mm test tube was filled with K2SO4 (30mL, 0.15 mol) saturated at 0  °C in 5M H2SO4. The test tube was immersed in ice, power supply was adjusted to give the solution a current of ~3.0 amps. Current was read and recorded as accurately a possible, as well as the time over which electrolysis was carried out. K2S2O8 precipitated over a period of 45-50 minutes during which the temperature was maintained close to 0  °C (~8  °C or lower) during electrolysis. Crystals were collected in a Buchner funnel, washed with alcohol, then ether, then transferred into a sample tube for storage. B. Reactions of Peroxodisulfate Ion A saturated solution of K2S2O8 in water was prepared and the following reactions were carried out. The results were compared with similar reactions using hydrogen peroxide. 1) Acidified KI solution, warming gently 2) Silver nitrate solution 3) MnSO4 solution in 2M H2SO4, containing 1 drop of AgNO3 solution 4) Titanium (IV) sulphate solution C. Preparation of Tetrapyridinecopper(II) Peroxodisulfate Solutions of CuSO4ï‚Ÿ5H2O (0.506 g in 10mL water, 3.17E-3 mol) and ammonium peroxodisulfate (1.030 g in 10mL water, 4.51E-3 mol) were prepared and mixedShow MoreRelatedThe Doping Of Semiconductor By Rare Earth Metal Nanoparticle1754 Words   |  8 Pagesensures high chemical homogeneity because of the aqueous solution mixture of initial reagents that favors the production of desired phases. Among the soft-chemistry techniques, the gel-combustion method needss comparatively shorter reaction times and lower temperatures. Recently gel combustion method has been utilized in organic and inorganic synthesis [36]. The benefits of gel-combustion methods includes fine chemical homogeneity, high purity fine particles size distribution and easy doping etc. There