Abstract
The constant‐current electrolysis technique was utilized to determine the oxidation state of gold in iodide media. The products from the electrolysis of gold metal in KI with 0.1 M borate were analyzed by means of electrogravimetry for gold and spectrophotometry for . At low current density, the gold species formed during the electrolysis process was Au(I) in KI with 0.1 M borate. Voltammetric measurements for the solution resulting from electrochemical dissolution of gold in on a glassy carbon rotating disk electrode enable us to measure the diffusion coefficient of Au(I) in the same medium, which was found to be . The equilibrium of the chemical reaction between gold and iodine in the medium of was also studied. The experimental results confirmed that the complex formed between Au(I) and iodide is . The stability constant for was determined by direct analysis of equilibrated solutions and was found to be .
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