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- W2560399848 abstract "Abstract The pure gold dissolution has been explored in (dilute) chloric, bromic, or iodic acid (HXO3, X = Cl, Br, I) aqueous solution containing abundant halide ions at 60 °C. It has been found that mixtures between sodium chlorate and HCl (NaClO3 + HCl ⇆ HClO3 + NaCl) in 20 mL are effective media for the dissolution of pure gold-wire (99.95 %, ca. 20 mg, 0.25 mm diameter). The gold-wire dissolution is much more enhanced by HBr than HCl in NaClO3 solution. At 0.50 mol dm-3 NaClO3, for instance, log (k/s-1) values are -5.11 and -3.40 (ca. 50-fold increase) for 1.0 mol dm-3 HCl and HBr, respectively, where “pseudo” first-order dissolution rate constants (k/s-1) have been evaluated by the changes in the mass of gold-wire. In HClO3 solution containing abundant halide ions (X- = Cl-, Br-), the Au metal should be oxidized mainly by X2 to be AuX4-, where X2 is produced by the oxidizing power from HClO3, just as dilute HNO3 ( ~ 5 mol dm-3)." @default.
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- W2560399848 date "2017-02-01" @default.
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- W2560399848 title "Pure gold dissolution in dilute chloric, bromic or iodic acid solution containing abundant halide ions" @default.
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- W2560399848 doi "https://doi.org/10.1016/j.molliq.2016.12.003" @default.
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