Redox and redox equilibria
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- I am currently investigating the iodine clock reaction involving hydrogen peroxide. I don't understand how to work out if the overall equation is redox, especially in view to oxidation numbers? I also understand that the overall reaction can be split into 'half-equations' but am not sure how to go about this. 210208
- I'm doing my background chemistry for a redox titration to determine the concentration of copper ions using potassium iodide. I know the ionic equation I need is: 2Cu2+(aq) + 4I-(aq) -> 2CuI(s) + I2(aq) I'm having problems explaining why this reaction occurs though because my two half-equations are: Cu2+(aq) + e- ->Cu+(aq) - Eo = 0.15 V I2(aq) + 2e- -> 2I-(aq) - Eo = 0.54 V The Eo values would normally mean I would reverse the Cu half-cell as it has the more negative Eo value. But to get my overall ionic equation I actually need to reverse the iodine half-cell. So I'm confused why the reaction occurs. Vikki
- Can you please tell me what is the difference between a galvanic cell and an electrolytic cell? I am very confused about their sign designations at the anode. 280410
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updated: 21 August 2003

