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In the redox reaction Cr2O7^{2-}(aq) + Cu^+(aq) → Cr^{3+}(aq) + Cu^{2+}(aq), which species is oxidized?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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In a redox reaction, which species is the reducing agent?
A
The species that does not change oxidation number
B
The species that is reduced (gains electrons)
C
The species with the greatest molar mass
D
The species that is oxidized (loses electrons)
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Understand the definitions of oxidation and reduction: Oxidation is the loss of electrons, and reduction is the gain of electrons.
Identify the reducing agent as the species that causes another species to be reduced by donating electrons itself.
Recognize that the reducing agent is the species that is oxidized (loses electrons) during the redox reaction.
Note that the species that is reduced (gains electrons) is called the oxidizing agent, not the reducing agent.
Conclude that the correct answer is the species that is oxidized (loses electrons), because it donates electrons and reduces another species.
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