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- W1981992447 abstract "Abstract The tetrahydroxoargentate(III) ion, Ag(OH) 4 − , is rapidly reduced by thiourea (tu) in accordance with the three term rate law rate = { k 1 +( k 2 + k 3 [OH − ])[tu]}[Ag III ] where k 1 = 1.08 s −1 , k 2 = 1.46 x 10 3 M −1 s −1 , and k 3 = 2.02 x 10 3 M −2 s −1 . The k 1 path occurs via the rate-determining aquation of Ag(OH) 4 − while the other two paths involve axial attack of thiourea on silver. The higher values of k 2 and k 3 compared to the ethylenediamine reaction, which obeys the same rate law, is a reflection of the greater nucleophilicity of tu. Following the redox reaction, solutions become brown in a reaction that obeys pseudo-first-order kinetics. Similar behaviour is observed when tu is replaced by Na 2 S or thio-acetamide and when Ag I reacts with any of these sulphur containing compounds. We attribute this process to the Ag I promoted formation of sulphide species which eventually precipitate as Ag 2 S." @default.
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- W1981992447 date "1988-01-01" @default.
- W1981992447 modified "2023-09-27" @default.
- W1981992447 title "Kinetics and mechanism of the reaction between silver(III) and thiourea in aqueous alkaline media" @default.
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- W1981992447 doi "https://doi.org/10.1016/s0277-5387(00)83902-9" @default.
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