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A Latimer diagram is a visual representation of the standard reduction potentials of a series of related species, typically of a single element in different oxidation states. It allows you to quickly determine the relative oxidizing and reducing power of each species and predict the most likely products of redox reactions. The species are arranged in order of decreasing oxidation state, with the most oxidized species on the left and the most reduced species on the right. Each arrow connects two species, and the number above the arrow indicates the standard reduction potential for the half-reaction involving those two species. For example, a Latimer diagram for chlorine would look like this:
ClO4- 1.20 ClO3- 1.19 ClO2 1.18 HClO 1.63 Cl2 1.36 Cl-
From this diagram, we can see that ClO4- is the strongest oxidizing agent (has the highest reduction potential), while Cl- is the weakest oxidizing agent (has the lowest reduction potential).