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The Latimer diagram for iron in acidic solution shows the standard reduction potentials for various oxidation states of iron. Here's a simplified representation:
Fe3+ + e- ⇌ Fe2+ E° = +0.77 V
Fe2+ + 2e- ⇌ Fe E° = -0.44 V
This diagram reveals:
Fe3+ is a good oxidizing agent, readily accepting electrons to become Fe2+.
Fe2+ is less easily reduced to Fe, indicating its stability in acidic solutions.