Potassium iodide in an ascorbic acid titration with iodine solution?

[flumbie]

When performing an ascorbic acid titration with iodine solution, iodine and potassium iodide are used. Does the potassium iodide react with the ascorbic acid as well or only the iodine?

Thanks

 

[symbolipoint]

The reactant is either the iodine or the iodide - I'm no familiar currently. Is the ascorbic acid being reduced? Or is it being oxidized? (I should not butt-in here, since someone familiar with the analytical method would answer this more properly).

 

[chemisttree]

iodine is the reactant, not iodide. Iodine is not very soluble in water but it forms a water-soluble complex, I3-, with iodide.