what was the mass of the ore sample? 12. Iodine can be extracted from seaweed. The seaweed is heated strongly to burn off the organic matter. The resultant ash is boiled in water to dissolve the iodide ions, and the mixture is filtered. Acidified hydrogen peroxide (H2O2) is added to the filtrate. A redox reaction takes place with iodine and water as the only products. (i) Write half-equations for the oxidation and reduction reactions that take place. State symbols are not required. (ii) Use your answers to (i) to write the overall equation for this redox reaction. State symbols are not required. 2