Decomposition of sodium thiosulfate under acidic conditions
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The decomposition of sodium thiosulfate under acidic conditions produces sulfur dioxide and elemental sulfur; therefore, in the iodometric method for determining copper, it is used to react with copper ions to form sulfide precipitates, thereby separating copper. If anyone knows, please give some advice. Thank you!
You surely haven’t understood the reaction equation and principle behind the iodometric determination of copper. Although it has been many years since I worked with volumetric analysis in laboratory tests, I still clearly remember that when determining copper using the iodometry method, the precipitate formed with copper is cuprous iodide, and not elemental sulfur produced by the decomposition of sodium thiosulfate. Sodium thiosulfate is used to titrate the iodine produced, not to form a precipitate with copper ions. Please take a close look at the principle of determining copper using the iodometric method in redox reactions.
The analysis of copper concentrate is divided into the long iodometry method and the short iodometry method. You are referring to the reaction that occurs during titration, while I am talking about the steps involved in separating copper using the long iodometry method: o