These questions relate to the secondary coulometric titration of vitamin C. In this titration an applied voltage is used to generate a current that oxidizes Iodide to iodine. Iodine then oxidizes vitamin C. A starch indicator detects excess iodine via the formation of I3- My questions are: 1) What direction does the current flow in this type of experiment? I would think from the voltage source, to the anode, then to the cathode then to the amperometer (sp?) then back to the voltage source? 2) What is happening at the cathode here? I know at the anode Iodide is oxidized. But I can't figure out what's going on at the cathode. 3) If the leads are reversed, what happens at the anode? No idea about this one.