Chemistry 3.2 - Redox Reactions 0.0 / 5 ? ChemistryRedoxA2/A-levelWJEC Created by: Tashaleese_99Created on: 19-04-17 16:07 What happens when iodine ions are added to a blue solution of copper ions? The copper ions oxidise the iodine ions, forming a brown solution of iodine. The copper ions are reduced, forming a ppt of CuI. 1 of 6 How can this reaction be used to determine the concentration of copper ions in the initial solution? Sodium thiosulphate can be added to the iodine solution produced. It is a common reducing agent. 2 of 6 What is iodine reduced to? Iodide ions. 3 of 6 What are thiosulphate ions oxidised to? S4O6^2- 4 of 6 As the sodium thiosulphate is added, the solution changes colour from brown to... Straw coloured. 5 of 6 When the straw colour is observed, another indicator is added. What indicator is this? Starch solution. 6 of 6
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