Oxidation - Reduction Reactions
Redox Titrations
Numerous oxidants are used to determine reducing agents by titration. Among the most important are permanganate (MnO4-), dichromate (Cr2O72-) and iodine (I2). Strong oxidants (MnO4- and Cr2O72-) can be employed for determination of iron(II) by oxidizing it to iron(III). Various other compounds can be determined in a similar fashion.
Iodine is not enough strong oxidant to oxidize Fe(II).  It reacts only with strong reducing agents. This makes it very helpful for determination of various pharmaceutical reagents (for example, vitamin C).
In our laboratory, you will perform
1) Determination of Fe(II) using permanganate titration
2) Determination of Fe(II) using dichromate titration

As a bonus experiment (one extra point!) you may want to determine 
3) Vitamin C with iodine.